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TOMOYO Linux Cross Reference
Linux/net/core/pktgen.c

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  1 /*
  2  * Authors:
  3  * Copyright 2001, 2002 by Robert Olsson <robert.olsson@its.uu.se>
  4  *                             Uppsala University and
  5  *                             Swedish University of Agricultural Sciences
  6  *
  7  * Alexey Kuznetsov  <kuznet@ms2.inr.ac.ru>
  8  * Ben Greear <greearb@candelatech.com>
  9  * Jens Låås <jens.laas@data.slu.se>
 10  *
 11  * This program is free software; you can redistribute it and/or
 12  * modify it under the terms of the GNU General Public License
 13  * as published by the Free Software Foundation; either version
 14  * 2 of the License, or (at your option) any later version.
 15  *
 16  *
 17  * A tool for loading the network with preconfigurated packets.
 18  * The tool is implemented as a linux module.  Parameters are output
 19  * device, delay (to hard_xmit), number of packets, and whether
 20  * to use multiple SKBs or just the same one.
 21  * pktgen uses the installed interface's output routine.
 22  *
 23  * Additional hacking by:
 24  *
 25  * Jens.Laas@data.slu.se
 26  * Improved by ANK. 010120.
 27  * Improved by ANK even more. 010212.
 28  * MAC address typo fixed. 010417 --ro
 29  * Integrated.  020301 --DaveM
 30  * Added multiskb option 020301 --DaveM
 31  * Scaling of results. 020417--sigurdur@linpro.no
 32  * Significant re-work of the module:
 33  *   *  Convert to threaded model to more efficiently be able to transmit
 34  *       and receive on multiple interfaces at once.
 35  *   *  Converted many counters to __u64 to allow longer runs.
 36  *   *  Allow configuration of ranges, like min/max IP address, MACs,
 37  *       and UDP-ports, for both source and destination, and can
 38  *       set to use a random distribution or sequentially walk the range.
 39  *   *  Can now change most values after starting.
 40  *   *  Place 12-byte packet in UDP payload with magic number,
 41  *       sequence number, and timestamp.
 42  *   *  Add receiver code that detects dropped pkts, re-ordered pkts, and
 43  *       latencies (with micro-second) precision.
 44  *   *  Add IOCTL interface to easily get counters & configuration.
 45  *   --Ben Greear <greearb@candelatech.com>
 46  *
 47  * Renamed multiskb to clone_skb and cleaned up sending core for two distinct
 48  * skb modes. A clone_skb=0 mode for Ben "ranges" work and a clone_skb != 0
 49  * as a "fastpath" with a configurable number of clones after alloc's.
 50  * clone_skb=0 means all packets are allocated this also means ranges time
 51  * stamps etc can be used. clone_skb=100 means 1 malloc is followed by 100
 52  * clones.
 53  *
 54  * Also moved to /proc/net/pktgen/
 55  * --ro
 56  *
 57  * Sept 10:  Fixed threading/locking.  Lots of bone-headed and more clever
 58  *    mistakes.  Also merged in DaveM's patch in the -pre6 patch.
 59  * --Ben Greear <greearb@candelatech.com>
 60  *
 61  * Integrated to 2.5.x 021029 --Lucio Maciel (luciomaciel@zipmail.com.br)
 62  *
 63  *
 64  * 021124 Finished major redesign and rewrite for new functionality.
 65  * See Documentation/networking/pktgen.txt for how to use this.
 66  *
 67  * The new operation:
 68  * For each CPU one thread/process is created at start. This process checks
 69  * for running devices in the if_list and sends packets until count is 0 it
 70  * also the thread checks the thread->control which is used for inter-process
 71  * communication. controlling process "posts" operations to the threads this
 72  * way.
 73  * The if_list is RCU protected, and the if_lock remains to protect updating
 74  * of if_list, from "add_device" as it invoked from userspace (via proc write).
 75  *
 76  * By design there should only be *one* "controlling" process. In practice
 77  * multiple write accesses gives unpredictable result. Understood by "write"
 78  * to /proc gives result code thats should be read be the "writer".
 79  * For practical use this should be no problem.
 80  *
 81  * Note when adding devices to a specific CPU there good idea to also assign
 82  * /proc/irq/XX/smp_affinity so TX-interrupts gets bound to the same CPU.
 83  * --ro
 84  *
 85  * Fix refcount off by one if first packet fails, potential null deref,
 86  * memleak 030710- KJP
 87  *
 88  * First "ranges" functionality for ipv6 030726 --ro
 89  *
 90  * Included flow support. 030802 ANK.
 91  *
 92  * Fixed unaligned access on IA-64 Grant Grundler <grundler@parisc-linux.org>
 93  *
 94  * Remove if fix from added Harald Welte <laforge@netfilter.org> 040419
 95  * ia64 compilation fix from  Aron Griffis <aron@hp.com> 040604
 96  *
 97  * New xmit() return, do_div and misc clean up by Stephen Hemminger
 98  * <shemminger@osdl.org> 040923
 99  *
100  * Randy Dunlap fixed u64 printk compiler warning
101  *
102  * Remove FCS from BW calculation.  Lennert Buytenhek <buytenh@wantstofly.org>
103  * New time handling. Lennert Buytenhek <buytenh@wantstofly.org> 041213
104  *
105  * Corrections from Nikolai Malykh (nmalykh@bilim.com)
106  * Removed unused flags F_SET_SRCMAC & F_SET_SRCIP 041230
107  *
108  * interruptible_sleep_on_timeout() replaced Nishanth Aravamudan <nacc@us.ibm.com>
109  * 050103
110  *
111  * MPLS support by Steven Whitehouse <steve@chygwyn.com>
112  *
113  * 802.1Q/Q-in-Q support by Francesco Fondelli (FF) <francesco.fondelli@gmail.com>
114  *
115  * Fixed src_mac command to set source mac of packet to value specified in
116  * command by Adit Ranadive <adit.262@gmail.com>
117  *
118  */
119 
120 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
121 
122 #include <linux/sys.h>
123 #include <linux/types.h>
124 #include <linux/module.h>
125 #include <linux/moduleparam.h>
126 #include <linux/kernel.h>
127 #include <linux/mutex.h>
128 #include <linux/sched.h>
129 #include <linux/slab.h>
130 #include <linux/vmalloc.h>
131 #include <linux/unistd.h>
132 #include <linux/string.h>
133 #include <linux/ptrace.h>
134 #include <linux/errno.h>
135 #include <linux/ioport.h>
136 #include <linux/interrupt.h>
137 #include <linux/capability.h>
138 #include <linux/hrtimer.h>
139 #include <linux/freezer.h>
140 #include <linux/delay.h>
141 #include <linux/timer.h>
142 #include <linux/list.h>
143 #include <linux/init.h>
144 #include <linux/skbuff.h>
145 #include <linux/netdevice.h>
146 #include <linux/inet.h>
147 #include <linux/inetdevice.h>
148 #include <linux/rtnetlink.h>
149 #include <linux/if_arp.h>
150 #include <linux/if_vlan.h>
151 #include <linux/in.h>
152 #include <linux/ip.h>
153 #include <linux/ipv6.h>
154 #include <linux/udp.h>
155 #include <linux/proc_fs.h>
156 #include <linux/seq_file.h>
157 #include <linux/wait.h>
158 #include <linux/etherdevice.h>
159 #include <linux/kthread.h>
160 #include <linux/prefetch.h>
161 #include <net/net_namespace.h>
162 #include <net/checksum.h>
163 #include <net/ipv6.h>
164 #include <net/udp.h>
165 #include <net/ip6_checksum.h>
166 #include <net/addrconf.h>
167 #ifdef CONFIG_XFRM
168 #include <net/xfrm.h>
169 #endif
170 #include <net/netns/generic.h>
171 #include <asm/byteorder.h>
172 #include <linux/rcupdate.h>
173 #include <linux/bitops.h>
174 #include <linux/io.h>
175 #include <linux/timex.h>
176 #include <linux/uaccess.h>
177 #include <asm/dma.h>
178 #include <asm/div64.h>          /* do_div */
179 
180 #define VERSION "2.75"
181 #define IP_NAME_SZ 32
182 #define MAX_MPLS_LABELS 16 /* This is the max label stack depth */
183 #define MPLS_STACK_BOTTOM htonl(0x00000100)
184 
185 #define func_enter() pr_debug("entering %s\n", __func__);
186 
187 /* Device flag bits */
188 #define F_IPSRC_RND   (1<<0)    /* IP-Src Random  */
189 #define F_IPDST_RND   (1<<1)    /* IP-Dst Random  */
190 #define F_UDPSRC_RND  (1<<2)    /* UDP-Src Random */
191 #define F_UDPDST_RND  (1<<3)    /* UDP-Dst Random */
192 #define F_MACSRC_RND  (1<<4)    /* MAC-Src Random */
193 #define F_MACDST_RND  (1<<5)    /* MAC-Dst Random */
194 #define F_TXSIZE_RND  (1<<6)    /* Transmit size is random */
195 #define F_IPV6        (1<<7)    /* Interface in IPV6 Mode */
196 #define F_MPLS_RND    (1<<8)    /* Random MPLS labels */
197 #define F_VID_RND     (1<<9)    /* Random VLAN ID */
198 #define F_SVID_RND    (1<<10)   /* Random SVLAN ID */
199 #define F_FLOW_SEQ    (1<<11)   /* Sequential flows */
200 #define F_IPSEC_ON    (1<<12)   /* ipsec on for flows */
201 #define F_QUEUE_MAP_RND (1<<13) /* queue map Random */
202 #define F_QUEUE_MAP_CPU (1<<14) /* queue map mirrors smp_processor_id() */
203 #define F_NODE          (1<<15) /* Node memory alloc*/
204 #define F_UDPCSUM       (1<<16) /* Include UDP checksum */
205 #define F_NO_TIMESTAMP  (1<<17) /* Don't timestamp packets (default TS) */
206 
207 /* Thread control flag bits */
208 #define T_STOP        (1<<0)    /* Stop run */
209 #define T_RUN         (1<<1)    /* Start run */
210 #define T_REMDEVALL   (1<<2)    /* Remove all devs */
211 #define T_REMDEV      (1<<3)    /* Remove one dev */
212 
213 /* Xmit modes */
214 #define M_START_XMIT            0       /* Default normal TX */
215 #define M_NETIF_RECEIVE         1       /* Inject packets into stack */
216 #define M_QUEUE_XMIT            2       /* Inject packet into qdisc */
217 
218 /* If lock -- protects updating of if_list */
219 #define   if_lock(t)           mutex_lock(&(t->if_lock));
220 #define   if_unlock(t)           mutex_unlock(&(t->if_lock));
221 
222 /* Used to help with determining the pkts on receive */
223 #define PKTGEN_MAGIC 0xbe9be955
224 #define PG_PROC_DIR "pktgen"
225 #define PGCTRL      "pgctrl"
226 
227 #define MAX_CFLOWS  65536
228 
229 #define VLAN_TAG_SIZE(x) ((x)->vlan_id == 0xffff ? 0 : 4)
230 #define SVLAN_TAG_SIZE(x) ((x)->svlan_id == 0xffff ? 0 : 4)
231 
232 struct flow_state {
233         __be32 cur_daddr;
234         int count;
235 #ifdef CONFIG_XFRM
236         struct xfrm_state *x;
237 #endif
238         __u32 flags;
239 };
240 
241 /* flow flag bits */
242 #define F_INIT   (1<<0)         /* flow has been initialized */
243 
244 struct pktgen_dev {
245         /*
246          * Try to keep frequent/infrequent used vars. separated.
247          */
248         struct proc_dir_entry *entry;   /* proc file */
249         struct pktgen_thread *pg_thread;/* the owner */
250         struct list_head list;          /* chaining in the thread's run-queue */
251         struct rcu_head  rcu;           /* freed by RCU */
252 
253         int running;            /* if false, the test will stop */
254 
255         /* If min != max, then we will either do a linear iteration, or
256          * we will do a random selection from within the range.
257          */
258         __u32 flags;
259         int xmit_mode;
260         int min_pkt_size;
261         int max_pkt_size;
262         int pkt_overhead;       /* overhead for MPLS, VLANs, IPSEC etc */
263         int nfrags;
264         int removal_mark;       /* non-zero => the device is marked for
265                                  * removal by worker thread */
266 
267         struct page *page;
268         u64 delay;              /* nano-seconds */
269 
270         __u64 count;            /* Default No packets to send */
271         __u64 sofar;            /* How many pkts we've sent so far */
272         __u64 tx_bytes;         /* How many bytes we've transmitted */
273         __u64 errors;           /* Errors when trying to transmit, */
274 
275         /* runtime counters relating to clone_skb */
276 
277         __u32 clone_count;
278         int last_ok;            /* Was last skb sent?
279                                  * Or a failed transmit of some sort?
280                                  * This will keep sequence numbers in order
281                                  */
282         ktime_t next_tx;
283         ktime_t started_at;
284         ktime_t stopped_at;
285         u64     idle_acc;       /* nano-seconds */
286 
287         __u32 seq_num;
288 
289         int clone_skb;          /*
290                                  * Use multiple SKBs during packet gen.
291                                  * If this number is greater than 1, then
292                                  * that many copies of the same packet will be
293                                  * sent before a new packet is allocated.
294                                  * If you want to send 1024 identical packets
295                                  * before creating a new packet,
296                                  * set clone_skb to 1024.
297                                  */
298 
299         char dst_min[IP_NAME_SZ];       /* IP, ie 1.2.3.4 */
300         char dst_max[IP_NAME_SZ];       /* IP, ie 1.2.3.4 */
301         char src_min[IP_NAME_SZ];       /* IP, ie 1.2.3.4 */
302         char src_max[IP_NAME_SZ];       /* IP, ie 1.2.3.4 */
303 
304         struct in6_addr in6_saddr;
305         struct in6_addr in6_daddr;
306         struct in6_addr cur_in6_daddr;
307         struct in6_addr cur_in6_saddr;
308         /* For ranges */
309         struct in6_addr min_in6_daddr;
310         struct in6_addr max_in6_daddr;
311         struct in6_addr min_in6_saddr;
312         struct in6_addr max_in6_saddr;
313 
314         /* If we're doing ranges, random or incremental, then this
315          * defines the min/max for those ranges.
316          */
317         __be32 saddr_min;       /* inclusive, source IP address */
318         __be32 saddr_max;       /* exclusive, source IP address */
319         __be32 daddr_min;       /* inclusive, dest IP address */
320         __be32 daddr_max;       /* exclusive, dest IP address */
321 
322         __u16 udp_src_min;      /* inclusive, source UDP port */
323         __u16 udp_src_max;      /* exclusive, source UDP port */
324         __u16 udp_dst_min;      /* inclusive, dest UDP port */
325         __u16 udp_dst_max;      /* exclusive, dest UDP port */
326 
327         /* DSCP + ECN */
328         __u8 tos;            /* six MSB of (former) IPv4 TOS
329                                 are for dscp codepoint */
330         __u8 traffic_class;  /* ditto for the (former) Traffic Class in IPv6
331                                 (see RFC 3260, sec. 4) */
332 
333         /* MPLS */
334         unsigned int nr_labels; /* Depth of stack, 0 = no MPLS */
335         __be32 labels[MAX_MPLS_LABELS];
336 
337         /* VLAN/SVLAN (802.1Q/Q-in-Q) */
338         __u8  vlan_p;
339         __u8  vlan_cfi;
340         __u16 vlan_id;  /* 0xffff means no vlan tag */
341 
342         __u8  svlan_p;
343         __u8  svlan_cfi;
344         __u16 svlan_id; /* 0xffff means no svlan tag */
345 
346         __u32 src_mac_count;    /* How many MACs to iterate through */
347         __u32 dst_mac_count;    /* How many MACs to iterate through */
348 
349         unsigned char dst_mac[ETH_ALEN];
350         unsigned char src_mac[ETH_ALEN];
351 
352         __u32 cur_dst_mac_offset;
353         __u32 cur_src_mac_offset;
354         __be32 cur_saddr;
355         __be32 cur_daddr;
356         __u16 ip_id;
357         __u16 cur_udp_dst;
358         __u16 cur_udp_src;
359         __u16 cur_queue_map;
360         __u32 cur_pkt_size;
361         __u32 last_pkt_size;
362 
363         __u8 hh[14];
364         /* = {
365            0x00, 0x80, 0xC8, 0x79, 0xB3, 0xCB,
366 
367            We fill in SRC address later
368            0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
369            0x08, 0x00
370            };
371          */
372         __u16 pad;              /* pad out the hh struct to an even 16 bytes */
373 
374         struct sk_buff *skb;    /* skb we are to transmit next, used for when we
375                                  * are transmitting the same one multiple times
376                                  */
377         struct net_device *odev; /* The out-going device.
378                                   * Note that the device should have it's
379                                   * pg_info pointer pointing back to this
380                                   * device.
381                                   * Set when the user specifies the out-going
382                                   * device name (not when the inject is
383                                   * started as it used to do.)
384                                   */
385         char odevname[32];
386         struct flow_state *flows;
387         unsigned int cflows;    /* Concurrent flows (config) */
388         unsigned int lflow;             /* Flow length  (config) */
389         unsigned int nflows;    /* accumulated flows (stats) */
390         unsigned int curfl;             /* current sequenced flow (state)*/
391 
392         u16 queue_map_min;
393         u16 queue_map_max;
394         __u32 skb_priority;     /* skb priority field */
395         unsigned int burst;     /* number of duplicated packets to burst */
396         int node;               /* Memory node */
397 
398 #ifdef CONFIG_XFRM
399         __u8    ipsmode;                /* IPSEC mode (config) */
400         __u8    ipsproto;               /* IPSEC type (config) */
401         __u32   spi;
402         struct dst_entry dst;
403         struct dst_ops dstops;
404 #endif
405         char result[512];
406 };
407 
408 struct pktgen_hdr {
409         __be32 pgh_magic;
410         __be32 seq_num;
411         __be32 tv_sec;
412         __be32 tv_usec;
413 };
414 
415 
416 static unsigned int pg_net_id __read_mostly;
417 
418 struct pktgen_net {
419         struct net              *net;
420         struct proc_dir_entry   *proc_dir;
421         struct list_head        pktgen_threads;
422         bool                    pktgen_exiting;
423 };
424 
425 struct pktgen_thread {
426         struct mutex if_lock;           /* for list of devices */
427         struct list_head if_list;       /* All device here */
428         struct list_head th_list;
429         struct task_struct *tsk;
430         char result[512];
431 
432         /* Field for thread to receive "posted" events terminate,
433            stop ifs etc. */
434 
435         u32 control;
436         int cpu;
437 
438         wait_queue_head_t queue;
439         struct completion start_done;
440         struct pktgen_net *net;
441 };
442 
443 #define REMOVE 1
444 #define FIND   0
445 
446 static const char version[] =
447         "Packet Generator for packet performance testing. "
448         "Version: " VERSION "\n";
449 
450 static int pktgen_remove_device(struct pktgen_thread *t, struct pktgen_dev *i);
451 static int pktgen_add_device(struct pktgen_thread *t, const char *ifname);
452 static struct pktgen_dev *pktgen_find_dev(struct pktgen_thread *t,
453                                           const char *ifname, bool exact);
454 static int pktgen_device_event(struct notifier_block *, unsigned long, void *);
455 static void pktgen_run_all_threads(struct pktgen_net *pn);
456 static void pktgen_reset_all_threads(struct pktgen_net *pn);
457 static void pktgen_stop_all_threads_ifs(struct pktgen_net *pn);
458 
459 static void pktgen_stop(struct pktgen_thread *t);
460 static void pktgen_clear_counters(struct pktgen_dev *pkt_dev);
461 
462 /* Module parameters, defaults. */
463 static int pg_count_d __read_mostly = 1000;
464 static int pg_delay_d __read_mostly;
465 static int pg_clone_skb_d  __read_mostly;
466 static int debug  __read_mostly;
467 
468 static DEFINE_MUTEX(pktgen_thread_lock);
469 
470 static struct notifier_block pktgen_notifier_block = {
471         .notifier_call = pktgen_device_event,
472 };
473 
474 /*
475  * /proc handling functions
476  *
477  */
478 
479 static int pgctrl_show(struct seq_file *seq, void *v)
480 {
481         seq_puts(seq, version);
482         return 0;
483 }
484 
485 static ssize_t pgctrl_write(struct file *file, const char __user *buf,
486                             size_t count, loff_t *ppos)
487 {
488         char data[128];
489         struct pktgen_net *pn = net_generic(current->nsproxy->net_ns, pg_net_id);
490 
491         if (!capable(CAP_NET_ADMIN))
492                 return -EPERM;
493 
494         if (count == 0)
495                 return -EINVAL;
496 
497         if (count > sizeof(data))
498                 count = sizeof(data);
499 
500         if (copy_from_user(data, buf, count))
501                 return -EFAULT;
502 
503         data[count - 1] = 0;    /* Strip trailing '\n' and terminate string */
504 
505         if (!strcmp(data, "stop"))
506                 pktgen_stop_all_threads_ifs(pn);
507 
508         else if (!strcmp(data, "start"))
509                 pktgen_run_all_threads(pn);
510 
511         else if (!strcmp(data, "reset"))
512                 pktgen_reset_all_threads(pn);
513 
514         else
515                 return -EINVAL;
516 
517         return count;
518 }
519 
520 static int pgctrl_open(struct inode *inode, struct file *file)
521 {
522         return single_open(file, pgctrl_show, PDE_DATA(inode));
523 }
524 
525 static const struct file_operations pktgen_fops = {
526         .owner   = THIS_MODULE,
527         .open    = pgctrl_open,
528         .read    = seq_read,
529         .llseek  = seq_lseek,
530         .write   = pgctrl_write,
531         .release = single_release,
532 };
533 
534 static int pktgen_if_show(struct seq_file *seq, void *v)
535 {
536         const struct pktgen_dev *pkt_dev = seq->private;
537         ktime_t stopped;
538         u64 idle;
539 
540         seq_printf(seq,
541                    "Params: count %llu  min_pkt_size: %u  max_pkt_size: %u\n",
542                    (unsigned long long)pkt_dev->count, pkt_dev->min_pkt_size,
543                    pkt_dev->max_pkt_size);
544 
545         seq_printf(seq,
546                    "     frags: %d  delay: %llu  clone_skb: %d  ifname: %s\n",
547                    pkt_dev->nfrags, (unsigned long long) pkt_dev->delay,
548                    pkt_dev->clone_skb, pkt_dev->odevname);
549 
550         seq_printf(seq, "     flows: %u flowlen: %u\n", pkt_dev->cflows,
551                    pkt_dev->lflow);
552 
553         seq_printf(seq,
554                    "     queue_map_min: %u  queue_map_max: %u\n",
555                    pkt_dev->queue_map_min,
556                    pkt_dev->queue_map_max);
557 
558         if (pkt_dev->skb_priority)
559                 seq_printf(seq, "     skb_priority: %u\n",
560                            pkt_dev->skb_priority);
561 
562         if (pkt_dev->flags & F_IPV6) {
563                 seq_printf(seq,
564                            "     saddr: %pI6c  min_saddr: %pI6c  max_saddr: %pI6c\n"
565                            "     daddr: %pI6c  min_daddr: %pI6c  max_daddr: %pI6c\n",
566                            &pkt_dev->in6_saddr,
567                            &pkt_dev->min_in6_saddr, &pkt_dev->max_in6_saddr,
568                            &pkt_dev->in6_daddr,
569                            &pkt_dev->min_in6_daddr, &pkt_dev->max_in6_daddr);
570         } else {
571                 seq_printf(seq,
572                            "     dst_min: %s  dst_max: %s\n",
573                            pkt_dev->dst_min, pkt_dev->dst_max);
574                 seq_printf(seq,
575                            "     src_min: %s  src_max: %s\n",
576                            pkt_dev->src_min, pkt_dev->src_max);
577         }
578 
579         seq_puts(seq, "     src_mac: ");
580 
581         seq_printf(seq, "%pM ",
582                    is_zero_ether_addr(pkt_dev->src_mac) ?
583                              pkt_dev->odev->dev_addr : pkt_dev->src_mac);
584 
585         seq_puts(seq, "dst_mac: ");
586         seq_printf(seq, "%pM\n", pkt_dev->dst_mac);
587 
588         seq_printf(seq,
589                    "     udp_src_min: %d  udp_src_max: %d"
590                    "  udp_dst_min: %d  udp_dst_max: %d\n",
591                    pkt_dev->udp_src_min, pkt_dev->udp_src_max,
592                    pkt_dev->udp_dst_min, pkt_dev->udp_dst_max);
593 
594         seq_printf(seq,
595                    "     src_mac_count: %d  dst_mac_count: %d\n",
596                    pkt_dev->src_mac_count, pkt_dev->dst_mac_count);
597 
598         if (pkt_dev->nr_labels) {
599                 unsigned int i;
600                 seq_puts(seq, "     mpls: ");
601                 for (i = 0; i < pkt_dev->nr_labels; i++)
602                         seq_printf(seq, "%08x%s", ntohl(pkt_dev->labels[i]),
603                                    i == pkt_dev->nr_labels-1 ? "\n" : ", ");
604         }
605 
606         if (pkt_dev->vlan_id != 0xffff)
607                 seq_printf(seq, "     vlan_id: %u  vlan_p: %u  vlan_cfi: %u\n",
608                            pkt_dev->vlan_id, pkt_dev->vlan_p,
609                            pkt_dev->vlan_cfi);
610 
611         if (pkt_dev->svlan_id != 0xffff)
612                 seq_printf(seq, "     svlan_id: %u  vlan_p: %u  vlan_cfi: %u\n",
613                            pkt_dev->svlan_id, pkt_dev->svlan_p,
614                            pkt_dev->svlan_cfi);
615 
616         if (pkt_dev->tos)
617                 seq_printf(seq, "     tos: 0x%02x\n", pkt_dev->tos);
618 
619         if (pkt_dev->traffic_class)
620                 seq_printf(seq, "     traffic_class: 0x%02x\n", pkt_dev->traffic_class);
621 
622         if (pkt_dev->burst > 1)
623                 seq_printf(seq, "     burst: %d\n", pkt_dev->burst);
624 
625         if (pkt_dev->node >= 0)
626                 seq_printf(seq, "     node: %d\n", pkt_dev->node);
627 
628         if (pkt_dev->xmit_mode == M_NETIF_RECEIVE)
629                 seq_puts(seq, "     xmit_mode: netif_receive\n");
630         else if (pkt_dev->xmit_mode == M_QUEUE_XMIT)
631                 seq_puts(seq, "     xmit_mode: xmit_queue\n");
632 
633         seq_puts(seq, "     Flags: ");
634 
635         if (pkt_dev->flags & F_IPV6)
636                 seq_puts(seq, "IPV6  ");
637 
638         if (pkt_dev->flags & F_IPSRC_RND)
639                 seq_puts(seq, "IPSRC_RND  ");
640 
641         if (pkt_dev->flags & F_IPDST_RND)
642                 seq_puts(seq, "IPDST_RND  ");
643 
644         if (pkt_dev->flags & F_TXSIZE_RND)
645                 seq_puts(seq, "TXSIZE_RND  ");
646 
647         if (pkt_dev->flags & F_UDPSRC_RND)
648                 seq_puts(seq, "UDPSRC_RND  ");
649 
650         if (pkt_dev->flags & F_UDPDST_RND)
651                 seq_puts(seq, "UDPDST_RND  ");
652 
653         if (pkt_dev->flags & F_UDPCSUM)
654                 seq_puts(seq, "UDPCSUM  ");
655 
656         if (pkt_dev->flags & F_NO_TIMESTAMP)
657                 seq_puts(seq, "NO_TIMESTAMP  ");
658 
659         if (pkt_dev->flags & F_MPLS_RND)
660                 seq_puts(seq,  "MPLS_RND  ");
661 
662         if (pkt_dev->flags & F_QUEUE_MAP_RND)
663                 seq_puts(seq,  "QUEUE_MAP_RND  ");
664 
665         if (pkt_dev->flags & F_QUEUE_MAP_CPU)
666                 seq_puts(seq,  "QUEUE_MAP_CPU  ");
667 
668         if (pkt_dev->cflows) {
669                 if (pkt_dev->flags & F_FLOW_SEQ)
670                         seq_puts(seq,  "FLOW_SEQ  "); /*in sequence flows*/
671                 else
672                         seq_puts(seq,  "FLOW_RND  ");
673         }
674 
675 #ifdef CONFIG_XFRM
676         if (pkt_dev->flags & F_IPSEC_ON) {
677                 seq_puts(seq,  "IPSEC  ");
678                 if (pkt_dev->spi)
679                         seq_printf(seq, "spi:%u", pkt_dev->spi);
680         }
681 #endif
682 
683         if (pkt_dev->flags & F_MACSRC_RND)
684                 seq_puts(seq, "MACSRC_RND  ");
685 
686         if (pkt_dev->flags & F_MACDST_RND)
687                 seq_puts(seq, "MACDST_RND  ");
688 
689         if (pkt_dev->flags & F_VID_RND)
690                 seq_puts(seq, "VID_RND  ");
691 
692         if (pkt_dev->flags & F_SVID_RND)
693                 seq_puts(seq, "SVID_RND  ");
694 
695         if (pkt_dev->flags & F_NODE)
696                 seq_puts(seq, "NODE_ALLOC  ");
697 
698         seq_puts(seq, "\n");
699 
700         /* not really stopped, more like last-running-at */
701         stopped = pkt_dev->running ? ktime_get() : pkt_dev->stopped_at;
702         idle = pkt_dev->idle_acc;
703         do_div(idle, NSEC_PER_USEC);
704 
705         seq_printf(seq,
706                    "Current:\n     pkts-sofar: %llu  errors: %llu\n",
707                    (unsigned long long)pkt_dev->sofar,
708                    (unsigned long long)pkt_dev->errors);
709 
710         seq_printf(seq,
711                    "     started: %lluus  stopped: %lluus idle: %lluus\n",
712                    (unsigned long long) ktime_to_us(pkt_dev->started_at),
713                    (unsigned long long) ktime_to_us(stopped),
714                    (unsigned long long) idle);
715 
716         seq_printf(seq,
717                    "     seq_num: %d  cur_dst_mac_offset: %d  cur_src_mac_offset: %d\n",
718                    pkt_dev->seq_num, pkt_dev->cur_dst_mac_offset,
719                    pkt_dev->cur_src_mac_offset);
720 
721         if (pkt_dev->flags & F_IPV6) {
722                 seq_printf(seq, "     cur_saddr: %pI6c  cur_daddr: %pI6c\n",
723                                 &pkt_dev->cur_in6_saddr,
724                                 &pkt_dev->cur_in6_daddr);
725         } else
726                 seq_printf(seq, "     cur_saddr: %pI4  cur_daddr: %pI4\n",
727                            &pkt_dev->cur_saddr, &pkt_dev->cur_daddr);
728 
729         seq_printf(seq, "     cur_udp_dst: %d  cur_udp_src: %d\n",
730                    pkt_dev->cur_udp_dst, pkt_dev->cur_udp_src);
731 
732         seq_printf(seq, "     cur_queue_map: %u\n", pkt_dev->cur_queue_map);
733 
734         seq_printf(seq, "     flows: %u\n", pkt_dev->nflows);
735 
736         if (pkt_dev->result[0])
737                 seq_printf(seq, "Result: %s\n", pkt_dev->result);
738         else
739                 seq_puts(seq, "Result: Idle\n");
740 
741         return 0;
742 }
743 
744 
745 static int hex32_arg(const char __user *user_buffer, unsigned long maxlen,
746                      __u32 *num)
747 {
748         int i = 0;
749         *num = 0;
750 
751         for (; i < maxlen; i++) {
752                 int value;
753                 char c;
754                 *num <<= 4;
755                 if (get_user(c, &user_buffer[i]))
756                         return -EFAULT;
757                 value = hex_to_bin(c);
758                 if (value >= 0)
759                         *num |= value;
760                 else
761                         break;
762         }
763         return i;
764 }
765 
766 static int count_trail_chars(const char __user * user_buffer,
767                              unsigned int maxlen)
768 {
769         int i;
770 
771         for (i = 0; i < maxlen; i++) {
772                 char c;
773                 if (get_user(c, &user_buffer[i]))
774                         return -EFAULT;
775                 switch (c) {
776                 case '\"':
777                 case '\n':
778                 case '\r':
779                 case '\t':
780                 case ' ':
781                 case '=':
782                         break;
783                 default:
784                         goto done;
785                 }
786         }
787 done:
788         return i;
789 }
790 
791 static long num_arg(const char __user *user_buffer, unsigned long maxlen,
792                                 unsigned long *num)
793 {
794         int i;
795         *num = 0;
796 
797         for (i = 0; i < maxlen; i++) {
798                 char c;
799                 if (get_user(c, &user_buffer[i]))
800                         return -EFAULT;
801                 if ((c >= '') && (c <= '9')) {
802                         *num *= 10;
803                         *num += c - '';
804                 } else
805                         break;
806         }
807         return i;
808 }
809 
810 static int strn_len(const char __user * user_buffer, unsigned int maxlen)
811 {
812         int i;
813 
814         for (i = 0; i < maxlen; i++) {
815                 char c;
816                 if (get_user(c, &user_buffer[i]))
817                         return -EFAULT;
818                 switch (c) {
819                 case '\"':
820                 case '\n':
821                 case '\r':
822                 case '\t':
823                 case ' ':
824                         goto done_str;
825                 default:
826                         break;
827                 }
828         }
829 done_str:
830         return i;
831 }
832 
833 static ssize_t get_labels(const char __user *buffer, struct pktgen_dev *pkt_dev)
834 {
835         unsigned int n = 0;
836         char c;
837         ssize_t i = 0;
838         int len;
839 
840         pkt_dev->nr_labels = 0;
841         do {
842                 __u32 tmp;
843                 len = hex32_arg(&buffer[i], 8, &tmp);
844                 if (len <= 0)
845                         return len;
846                 pkt_dev->labels[n] = htonl(tmp);
847                 if (pkt_dev->labels[n] & MPLS_STACK_BOTTOM)
848                         pkt_dev->flags |= F_MPLS_RND;
849                 i += len;
850                 if (get_user(c, &buffer[i]))
851                         return -EFAULT;
852                 i++;
853                 n++;
854                 if (n >= MAX_MPLS_LABELS)
855                         return -E2BIG;
856         } while (c == ',');
857 
858         pkt_dev->nr_labels = n;
859         return i;
860 }
861 
862 static ssize_t pktgen_if_write(struct file *file,
863                                const char __user * user_buffer, size_t count,
864                                loff_t * offset)
865 {
866         struct seq_file *seq = file->private_data;
867         struct pktgen_dev *pkt_dev = seq->private;
868         int i, max, len;
869         char name[16], valstr[32];
870         unsigned long value = 0;
871         char *pg_result = NULL;
872         int tmp = 0;
873         char buf[128];
874 
875         pg_result = &(pkt_dev->result[0]);
876 
877         if (count < 1) {
878                 pr_warn("wrong command format\n");
879                 return -EINVAL;
880         }
881 
882         max = count;
883         tmp = count_trail_chars(user_buffer, max);
884         if (tmp < 0) {
885                 pr_warn("illegal format\n");
886                 return tmp;
887         }
888         i = tmp;
889 
890         /* Read variable name */
891 
892         len = strn_len(&user_buffer[i], sizeof(name) - 1);
893         if (len < 0)
894                 return len;
895 
896         memset(name, 0, sizeof(name));
897         if (copy_from_user(name, &user_buffer[i], len))
898                 return -EFAULT;
899         i += len;
900 
901         max = count - i;
902         len = count_trail_chars(&user_buffer[i], max);
903         if (len < 0)
904                 return len;
905 
906         i += len;
907 
908         if (debug) {
909                 size_t copy = min_t(size_t, count, 1023);
910                 char tb[copy + 1];
911                 if (copy_from_user(tb, user_buffer, copy))
912                         return -EFAULT;
913                 tb[copy] = 0;
914                 pr_debug("%s,%lu  buffer -:%s:-\n",
915                          name, (unsigned long)count, tb);
916         }
917 
918         if (!strcmp(name, "min_pkt_size")) {
919                 len = num_arg(&user_buffer[i], 10, &value);
920                 if (len < 0)
921                         return len;
922 
923                 i += len;
924                 if (value < 14 + 20 + 8)
925                         value = 14 + 20 + 8;
926                 if (value != pkt_dev->min_pkt_size) {
927                         pkt_dev->min_pkt_size = value;
928                         pkt_dev->cur_pkt_size = value;
929                 }
930                 sprintf(pg_result, "OK: min_pkt_size=%u",
931                         pkt_dev->min_pkt_size);
932                 return count;
933         }
934 
935         if (!strcmp(name, "max_pkt_size")) {
936                 len = num_arg(&user_buffer[i], 10, &value);
937                 if (len < 0)
938                         return len;
939 
940                 i += len;
941                 if (value < 14 + 20 + 8)
942                         value = 14 + 20 + 8;
943                 if (value != pkt_dev->max_pkt_size) {
944                         pkt_dev->max_pkt_size = value;
945                         pkt_dev->cur_pkt_size = value;
946                 }
947                 sprintf(pg_result, "OK: max_pkt_size=%u",
948                         pkt_dev->max_pkt_size);
949                 return count;
950         }
951 
952         /* Shortcut for min = max */
953 
954         if (!strcmp(name, "pkt_size")) {
955                 len = num_arg(&user_buffer[i], 10, &value);
956                 if (len < 0)
957                         return len;
958 
959                 i += len;
960                 if (value < 14 + 20 + 8)
961                         value = 14 + 20 + 8;
962                 if (value != pkt_dev->min_pkt_size) {
963                         pkt_dev->min_pkt_size = value;
964                         pkt_dev->max_pkt_size = value;
965                         pkt_dev->cur_pkt_size = value;
966                 }
967                 sprintf(pg_result, "OK: pkt_size=%u", pkt_dev->min_pkt_size);
968                 return count;
969         }
970 
971         if (!strcmp(name, "debug")) {
972                 len = num_arg(&user_buffer[i], 10, &value);
973                 if (len < 0)
974                         return len;
975 
976                 i += len;
977                 debug = value;
978                 sprintf(pg_result, "OK: debug=%u", debug);
979                 return count;
980         }
981 
982         if (!strcmp(name, "frags")) {
983                 len = num_arg(&user_buffer[i], 10, &value);
984                 if (len < 0)
985                         return len;
986 
987                 i += len;
988                 pkt_dev->nfrags = value;
989                 sprintf(pg_result, "OK: frags=%u", pkt_dev->nfrags);
990                 return count;
991         }
992         if (!strcmp(name, "delay")) {
993                 len = num_arg(&user_buffer[i], 10, &value);
994                 if (len < 0)
995                         return len;
996 
997                 i += len;
998                 if (value == 0x7FFFFFFF)
999                         pkt_dev->delay = ULLONG_MAX;
1000                 else
1001                         pkt_dev->delay = (u64)value;
1002 
1003                 sprintf(pg_result, "OK: delay=%llu",
1004                         (unsigned long long) pkt_dev->delay);
1005                 return count;
1006         }
1007         if (!strcmp(name, "rate")) {
1008                 len = num_arg(&user_buffer[i], 10, &value);
1009                 if (len < 0)
1010                         return len;
1011 
1012                 i += len;
1013                 if (!value)
1014                         return len;
1015                 pkt_dev->delay = pkt_dev->min_pkt_size*8*NSEC_PER_USEC/value;
1016                 if (debug)
1017                         pr_info("Delay set at: %llu ns\n", pkt_dev->delay);
1018 
1019                 sprintf(pg_result, "OK: rate=%lu", value);
1020                 return count;
1021         }
1022         if (!strcmp(name, "ratep")) {
1023                 len = num_arg(&user_buffer[i], 10, &value);
1024                 if (len < 0)
1025                         return len;
1026 
1027                 i += len;
1028                 if (!value)
1029                         return len;
1030                 pkt_dev->delay = NSEC_PER_SEC/value;
1031                 if (debug)
1032                         pr_info("Delay set at: %llu ns\n", pkt_dev->delay);
1033 
1034                 sprintf(pg_result, "OK: rate=%lu", value);
1035                 return count;
1036         }
1037         if (!strcmp(name, "udp_src_min")) {
1038                 len = num_arg(&user_buffer[i], 10, &value);
1039                 if (len < 0)
1040                         return len;
1041 
1042                 i += len;
1043                 if (value != pkt_dev->udp_src_min) {
1044                         pkt_dev->udp_src_min = value;
1045                         pkt_dev->cur_udp_src = value;
1046                 }
1047                 sprintf(pg_result, "OK: udp_src_min=%u", pkt_dev->udp_src_min);
1048                 return count;
1049         }
1050         if (!strcmp(name, "udp_dst_min")) {
1051                 len = num_arg(&user_buffer[i], 10, &value);
1052                 if (len < 0)
1053                         return len;
1054 
1055                 i += len;
1056                 if (value != pkt_dev->udp_dst_min) {
1057                         pkt_dev->udp_dst_min = value;
1058                         pkt_dev->cur_udp_dst = value;
1059                 }
1060                 sprintf(pg_result, "OK: udp_dst_min=%u", pkt_dev->udp_dst_min);
1061                 return count;
1062         }
1063         if (!strcmp(name, "udp_src_max")) {
1064                 len = num_arg(&user_buffer[i], 10, &value);
1065                 if (len < 0)
1066                         return len;
1067 
1068                 i += len;
1069                 if (value != pkt_dev->udp_src_max) {
1070                         pkt_dev->udp_src_max = value;
1071                         pkt_dev->cur_udp_src = value;
1072                 }
1073                 sprintf(pg_result, "OK: udp_src_max=%u", pkt_dev->udp_src_max);
1074                 return count;
1075         }
1076         if (!strcmp(name, "udp_dst_max")) {
1077                 len = num_arg(&user_buffer[i], 10, &value);
1078                 if (len < 0)
1079                         return len;
1080 
1081                 i += len;
1082                 if (value != pkt_dev->udp_dst_max) {
1083                         pkt_dev->udp_dst_max = value;
1084                         pkt_dev->cur_udp_dst = value;
1085                 }
1086                 sprintf(pg_result, "OK: udp_dst_max=%u", pkt_dev->udp_dst_max);
1087                 return count;
1088         }
1089         if (!strcmp(name, "clone_skb")) {
1090                 len = num_arg(&user_buffer[i], 10, &value);
1091                 if (len < 0)
1092                         return len;
1093                 if ((value > 0) &&
1094                     ((pkt_dev->xmit_mode == M_NETIF_RECEIVE) ||
1095                      !(pkt_dev->odev->priv_flags & IFF_TX_SKB_SHARING)))
1096                         return -ENOTSUPP;
1097                 i += len;
1098                 pkt_dev->clone_skb = value;
1099 
1100                 sprintf(pg_result, "OK: clone_skb=%d", pkt_dev->clone_skb);
1101                 return count;
1102         }
1103         if (!strcmp(name, "count")) {
1104                 len = num_arg(&user_buffer[i], 10, &value);
1105                 if (len < 0)
1106                         return len;
1107 
1108                 i += len;
1109                 pkt_dev->count = value;
1110                 sprintf(pg_result, "OK: count=%llu",
1111                         (unsigned long long)pkt_dev->count);
1112                 return count;
1113         }
1114         if (!strcmp(name, "src_mac_count")) {
1115                 len = num_arg(&user_buffer[i], 10, &value);
1116                 if (len < 0)
1117                         return len;
1118 
1119                 i += len;
1120                 if (pkt_dev->src_mac_count != value) {
1121                         pkt_dev->src_mac_count = value;
1122                         pkt_dev->cur_src_mac_offset = 0;
1123                 }
1124                 sprintf(pg_result, "OK: src_mac_count=%d",
1125                         pkt_dev->src_mac_count);
1126                 return count;
1127         }
1128         if (!strcmp(name, "dst_mac_count")) {
1129                 len = num_arg(&user_buffer[i], 10, &value);
1130                 if (len < 0)
1131                         return len;
1132 
1133                 i += len;
1134                 if (pkt_dev->dst_mac_count != value) {
1135                         pkt_dev->dst_mac_count = value;
1136                         pkt_dev->cur_dst_mac_offset = 0;
1137                 }
1138                 sprintf(pg_result, "OK: dst_mac_count=%d",
1139                         pkt_dev->dst_mac_count);
1140                 return count;
1141         }
1142         if (!strcmp(name, "burst")) {
1143                 len = num_arg(&user_buffer[i], 10, &value);
1144                 if (len < 0)
1145                         return len;
1146 
1147                 i += len;
1148                 if ((value > 1) &&
1149                     ((pkt_dev->xmit_mode == M_QUEUE_XMIT) ||
1150                      ((pkt_dev->xmit_mode == M_START_XMIT) &&
1151                      (!(pkt_dev->odev->priv_flags & IFF_TX_SKB_SHARING)))))
1152                         return -ENOTSUPP;
1153                 pkt_dev->burst = value < 1 ? 1 : value;
1154                 sprintf(pg_result, "OK: burst=%d", pkt_dev->burst);
1155                 return count;
1156         }
1157         if (!strcmp(name, "node")) {
1158                 len = num_arg(&user_buffer[i], 10, &value);
1159                 if (len < 0)
1160                         return len;
1161 
1162                 i += len;
1163 
1164                 if (node_possible(value)) {
1165                         pkt_dev->node = value;
1166                         sprintf(pg_result, "OK: node=%d", pkt_dev->node);
1167                         if (pkt_dev->page) {
1168                                 put_page(pkt_dev->page);
1169                                 pkt_dev->page = NULL;
1170                         }
1171                 }
1172                 else
1173                         sprintf(pg_result, "ERROR: node not possible");
1174                 return count;
1175         }
1176         if (!strcmp(name, "xmit_mode")) {
1177                 char f[32];
1178 
1179                 memset(f, 0, 32);
1180                 len = strn_len(&user_buffer[i], sizeof(f) - 1);
1181                 if (len < 0)
1182                         return len;
1183 
1184                 if (copy_from_user(f, &user_buffer[i], len))
1185                         return -EFAULT;
1186                 i += len;
1187 
1188                 if (strcmp(f, "start_xmit") == 0) {
1189                         pkt_dev->xmit_mode = M_START_XMIT;
1190                 } else if (strcmp(f, "netif_receive") == 0) {
1191                         /* clone_skb set earlier, not supported in this mode */
1192                         if (pkt_dev->clone_skb > 0)
1193                                 return -ENOTSUPP;
1194 
1195                         pkt_dev->xmit_mode = M_NETIF_RECEIVE;
1196 
1197                         /* make sure new packet is allocated every time
1198                          * pktgen_xmit() is called
1199                          */
1200                         pkt_dev->last_ok = 1;
1201 
1202                         /* override clone_skb if user passed default value
1203                          * at module loading time
1204                          */
1205                         pkt_dev->clone_skb = 0;
1206                 } else if (strcmp(f, "queue_xmit") == 0) {
1207                         pkt_dev->xmit_mode = M_QUEUE_XMIT;
1208                         pkt_dev->last_ok = 1;
1209                 } else {
1210                         sprintf(pg_result,
1211                                 "xmit_mode -:%s:- unknown\nAvailable modes: %s",
1212                                 f, "start_xmit, netif_receive\n");
1213                         return count;
1214                 }
1215                 sprintf(pg_result, "OK: xmit_mode=%s", f);
1216                 return count;
1217         }
1218         if (!strcmp(name, "flag")) {
1219                 char f[32];
1220                 memset(f, 0, 32);
1221                 len = strn_len(&user_buffer[i], sizeof(f) - 1);
1222                 if (len < 0)
1223                         return len;
1224 
1225                 if (copy_from_user(f, &user_buffer[i], len))
1226                         return -EFAULT;
1227                 i += len;
1228                 if (strcmp(f, "IPSRC_RND") == 0)
1229                         pkt_dev->flags |= F_IPSRC_RND;
1230 
1231                 else if (strcmp(f, "!IPSRC_RND") == 0)
1232                         pkt_dev->flags &= ~F_IPSRC_RND;
1233 
1234                 else if (strcmp(f, "TXSIZE_RND") == 0)
1235                         pkt_dev->flags |= F_TXSIZE_RND;
1236 
1237                 else if (strcmp(f, "!TXSIZE_RND") == 0)
1238                         pkt_dev->flags &= ~F_TXSIZE_RND;
1239 
1240                 else if (strcmp(f, "IPDST_RND") == 0)
1241                         pkt_dev->flags |= F_IPDST_RND;
1242 
1243                 else if (strcmp(f, "!IPDST_RND") == 0)
1244                         pkt_dev->flags &= ~F_IPDST_RND;
1245 
1246                 else if (strcmp(f, "UDPSRC_RND") == 0)
1247                         pkt_dev->flags |= F_UDPSRC_RND;
1248 
1249                 else if (strcmp(f, "!UDPSRC_RND") == 0)
1250                         pkt_dev->flags &= ~F_UDPSRC_RND;
1251 
1252                 else if (strcmp(f, "UDPDST_RND") == 0)
1253                         pkt_dev->flags |= F_UDPDST_RND;
1254 
1255                 else if (strcmp(f, "!UDPDST_RND") == 0)
1256                         pkt_dev->flags &= ~F_UDPDST_RND;
1257 
1258                 else if (strcmp(f, "MACSRC_RND") == 0)
1259                         pkt_dev->flags |= F_MACSRC_RND;
1260 
1261                 else if (strcmp(f, "!MACSRC_RND") == 0)
1262                         pkt_dev->flags &= ~F_MACSRC_RND;
1263 
1264                 else if (strcmp(f, "MACDST_RND") == 0)
1265                         pkt_dev->flags |= F_MACDST_RND;
1266 
1267                 else if (strcmp(f, "!MACDST_RND") == 0)
1268                         pkt_dev->flags &= ~F_MACDST_RND;
1269 
1270                 else if (strcmp(f, "MPLS_RND") == 0)
1271                         pkt_dev->flags |= F_MPLS_RND;
1272 
1273                 else if (strcmp(f, "!MPLS_RND") == 0)
1274                         pkt_dev->flags &= ~F_MPLS_RND;
1275 
1276                 else if (strcmp(f, "VID_RND") == 0)
1277                         pkt_dev->flags |= F_VID_RND;
1278 
1279                 else if (strcmp(f, "!VID_RND") == 0)
1280                         pkt_dev->flags &= ~F_VID_RND;
1281 
1282                 else if (strcmp(f, "SVID_RND") == 0)
1283                         pkt_dev->flags |= F_SVID_RND;
1284 
1285                 else if (strcmp(f, "!SVID_RND") == 0)
1286                         pkt_dev->flags &= ~F_SVID_RND;
1287 
1288                 else if (strcmp(f, "FLOW_SEQ") == 0)
1289                         pkt_dev->flags |= F_FLOW_SEQ;
1290 
1291                 else if (strcmp(f, "QUEUE_MAP_RND") == 0)
1292                         pkt_dev->flags |= F_QUEUE_MAP_RND;
1293 
1294                 else if (strcmp(f, "!QUEUE_MAP_RND") == 0)
1295                         pkt_dev->flags &= ~F_QUEUE_MAP_RND;
1296 
1297                 else if (strcmp(f, "QUEUE_MAP_CPU") == 0)
1298                         pkt_dev->flags |= F_QUEUE_MAP_CPU;
1299 
1300                 else if (strcmp(f, "!QUEUE_MAP_CPU") == 0)
1301                         pkt_dev->flags &= ~F_QUEUE_MAP_CPU;
1302 #ifdef CONFIG_XFRM
1303                 else if (strcmp(f, "IPSEC") == 0)
1304                         pkt_dev->flags |= F_IPSEC_ON;
1305 #endif
1306 
1307                 else if (strcmp(f, "!IPV6") == 0)
1308                         pkt_dev->flags &= ~F_IPV6;
1309 
1310                 else if (strcmp(f, "NODE_ALLOC") == 0)
1311                         pkt_dev->flags |= F_NODE;
1312 
1313                 else if (strcmp(f, "!NODE_ALLOC") == 0)
1314                         pkt_dev->flags &= ~F_NODE;
1315 
1316                 else if (strcmp(f, "UDPCSUM") == 0)
1317                         pkt_dev->flags |= F_UDPCSUM;
1318 
1319                 else if (strcmp(f, "!UDPCSUM") == 0)
1320                         pkt_dev->flags &= ~F_UDPCSUM;
1321 
1322                 else if (strcmp(f, "NO_TIMESTAMP") == 0)
1323                         pkt_dev->flags |= F_NO_TIMESTAMP;
1324 
1325                 else if (strcmp(f, "!NO_TIMESTAMP") == 0)
1326                         pkt_dev->flags &= ~F_NO_TIMESTAMP;
1327 
1328                 else {
1329                         sprintf(pg_result,
1330                                 "Flag -:%s:- unknown\nAvailable flags, (prepend ! to un-set flag):\n%s",
1331                                 f,
1332                                 "IPSRC_RND, IPDST_RND, UDPSRC_RND, UDPDST_RND, "
1333                                 "MACSRC_RND, MACDST_RND, TXSIZE_RND, IPV6, "
1334                                 "MPLS_RND, VID_RND, SVID_RND, FLOW_SEQ, "
1335                                 "QUEUE_MAP_RND, QUEUE_MAP_CPU, UDPCSUM, "
1336                                 "NO_TIMESTAMP, "
1337 #ifdef CONFIG_XFRM
1338                                 "IPSEC, "
1339 #endif
1340                                 "NODE_ALLOC\n");
1341                         return count;
1342                 }
1343                 sprintf(pg_result, "OK: flags=0x%x", pkt_dev->flags);
1344                 return count;
1345         }
1346         if (!strcmp(name, "dst_min") || !strcmp(name, "dst")) {
1347                 len = strn_len(&user_buffer[i], sizeof(pkt_dev->dst_min) - 1);
1348                 if (len < 0)
1349                         return len;
1350 
1351                 if (copy_from_user(buf, &user_buffer[i], len))
1352                         return -EFAULT;
1353                 buf[len] = 0;
1354                 if (strcmp(buf, pkt_dev->dst_min) != 0) {
1355                         memset(pkt_dev->dst_min, 0, sizeof(pkt_dev->dst_min));
1356                         strncpy(pkt_dev->dst_min, buf, len);
1357                         pkt_dev->daddr_min = in_aton(pkt_dev->dst_min);
1358                         pkt_dev->cur_daddr = pkt_dev->daddr_min;
1359                 }
1360                 if (debug)
1361                         pr_debug("dst_min set to: %s\n", pkt_dev->dst_min);
1362                 i += len;
1363                 sprintf(pg_result, "OK: dst_min=%s", pkt_dev->dst_min);
1364                 return count;
1365         }
1366         if (!strcmp(name, "dst_max")) {
1367                 len = strn_len(&user_buffer[i], sizeof(pkt_dev->dst_max) - 1);
1368                 if (len < 0)
1369                         return len;
1370 
1371 
1372                 if (copy_from_user(buf, &user_buffer[i], len))
1373                         return -EFAULT;
1374 
1375                 buf[len] = 0;
1376                 if (strcmp(buf, pkt_dev->dst_max) != 0) {
1377                         memset(pkt_dev->dst_max, 0, sizeof(pkt_dev->dst_max));
1378                         strncpy(pkt_dev->dst_max, buf, len);
1379                         pkt_dev->daddr_max = in_aton(pkt_dev->dst_max);
1380                         pkt_dev->cur_daddr = pkt_dev->daddr_max;
1381                 }
1382                 if (debug)
1383                         pr_debug("dst_max set to: %s\n", pkt_dev->dst_max);
1384                 i += len;
1385                 sprintf(pg_result, "OK: dst_max=%s", pkt_dev->dst_max);
1386                 return count;
1387         }
1388         if (!strcmp(name, "dst6")) {
1389                 len = strn_len(&user_buffer[i], sizeof(buf) - 1);
1390                 if (len < 0)
1391                         return len;
1392 
1393                 pkt_dev->flags |= F_IPV6;
1394 
1395                 if (copy_from_user(buf, &user_buffer[i], len))
1396                         return -EFAULT;
1397                 buf[len] = 0;
1398 
1399                 in6_pton(buf, -1, pkt_dev->in6_daddr.s6_addr, -1, NULL);
1400                 snprintf(buf, sizeof(buf), "%pI6c", &pkt_dev->in6_daddr);
1401 
1402                 pkt_dev->cur_in6_daddr = pkt_dev->in6_daddr;
1403 
1404                 if (debug)
1405                         pr_debug("dst6 set to: %s\n", buf);
1406 
1407                 i += len;
1408                 sprintf(pg_result, "OK: dst6=%s", buf);
1409                 return count;
1410         }
1411         if (!strcmp(name, "dst6_min")) {
1412                 len = strn_len(&user_buffer[i], sizeof(buf) - 1);
1413                 if (len < 0)
1414                         return len;
1415 
1416                 pkt_dev->flags |= F_IPV6;
1417 
1418                 if (copy_from_user(buf, &user_buffer[i], len))
1419                         return -EFAULT;
1420                 buf[len] = 0;
1421 
1422                 in6_pton(buf, -1, pkt_dev->min_in6_daddr.s6_addr, -1, NULL);
1423                 snprintf(buf, sizeof(buf), "%pI6c", &pkt_dev->min_in6_daddr);
1424 
1425                 pkt_dev->cur_in6_daddr = pkt_dev->min_in6_daddr;
1426                 if (debug)
1427                         pr_debug("dst6_min set to: %s\n", buf);
1428 
1429                 i += len;
1430                 sprintf(pg_result, "OK: dst6_min=%s", buf);
1431                 return count;
1432         }
1433         if (!strcmp(name, "dst6_max")) {
1434                 len = strn_len(&user_buffer[i], sizeof(buf) - 1);
1435                 if (len < 0)
1436                         return len;
1437 
1438                 pkt_dev->flags |= F_IPV6;
1439 
1440                 if (copy_from_user(buf, &user_buffer[i], len))
1441                         return -EFAULT;
1442                 buf[len] = 0;
1443 
1444                 in6_pton(buf, -1, pkt_dev->max_in6_daddr.s6_addr, -1, NULL);
1445                 snprintf(buf, sizeof(buf), "%pI6c", &pkt_dev->max_in6_daddr);
1446 
1447                 if (debug)
1448                         pr_debug("dst6_max set to: %s\n", buf);
1449 
1450                 i += len;
1451                 sprintf(pg_result, "OK: dst6_max=%s", buf);
1452                 return count;
1453         }
1454         if (!strcmp(name, "src6")) {
1455                 len = strn_len(&user_buffer[i], sizeof(buf) - 1);
1456                 if (len < 0)
1457                         return len;
1458 
1459                 pkt_dev->flags |= F_IPV6;
1460 
1461                 if (copy_from_user(buf, &user_buffer[i], len))
1462                         return -EFAULT;
1463                 buf[len] = 0;
1464 
1465                 in6_pton(buf, -1, pkt_dev->in6_saddr.s6_addr, -1, NULL);
1466                 snprintf(buf, sizeof(buf), "%pI6c", &pkt_dev->in6_saddr);
1467 
1468                 pkt_dev->cur_in6_saddr = pkt_dev->in6_saddr;
1469 
1470                 if (debug)
1471                         pr_debug("src6 set to: %s\n", buf);
1472 
1473                 i += len;
1474                 sprintf(pg_result, "OK: src6=%s", buf);
1475                 return count;
1476         }
1477         if (!strcmp(name, "src_min")) {
1478                 len = strn_len(&user_buffer[i], sizeof(pkt_dev->src_min) - 1);
1479                 if (len < 0)
1480                         return len;
1481 
1482                 if (copy_from_user(buf, &user_buffer[i], len))
1483                         return -EFAULT;
1484                 buf[len] = 0;
1485                 if (strcmp(buf, pkt_dev->src_min) != 0) {
1486                         memset(pkt_dev->src_min, 0, sizeof(pkt_dev->src_min));
1487                         strncpy(pkt_dev->src_min, buf, len);
1488                         pkt_dev->saddr_min = in_aton(pkt_dev->src_min);
1489                         pkt_dev->cur_saddr = pkt_dev->saddr_min;
1490                 }
1491                 if (debug)
1492                         pr_debug("src_min set to: %s\n", pkt_dev->src_min);
1493                 i += len;
1494                 sprintf(pg_result, "OK: src_min=%s", pkt_dev->src_min);
1495                 return count;
1496         }
1497         if (!strcmp(name, "src_max")) {
1498                 len = strn_len(&user_buffer[i], sizeof(pkt_dev->src_max) - 1);
1499                 if (len < 0)
1500                         return len;
1501 
1502                 if (copy_from_user(buf, &user_buffer[i], len))
1503                         return -EFAULT;
1504                 buf[len] = 0;
1505                 if (strcmp(buf, pkt_dev->src_max) != 0) {
1506                         memset(pkt_dev->src_max, 0, sizeof(pkt_dev->src_max));
1507                         strncpy(pkt_dev->src_max, buf, len);
1508                         pkt_dev->saddr_max = in_aton(pkt_dev->src_max);
1509                         pkt_dev->cur_saddr = pkt_dev->saddr_max;
1510                 }
1511                 if (debug)
1512                         pr_debug("src_max set to: %s\n", pkt_dev->src_max);
1513                 i += len;
1514                 sprintf(pg_result, "OK: src_max=%s", pkt_dev->src_max);
1515                 return count;
1516         }
1517         if (!strcmp(name, "dst_mac")) {
1518                 len = strn_len(&user_buffer[i], sizeof(valstr) - 1);
1519                 if (len < 0)
1520                         return len;
1521 
1522                 memset(valstr, 0, sizeof(valstr));
1523                 if (copy_from_user(valstr, &user_buffer[i], len))
1524                         return -EFAULT;
1525 
1526                 if (!mac_pton(valstr, pkt_dev->dst_mac))
1527                         return -EINVAL;
1528                 /* Set up Dest MAC */
1529                 ether_addr_copy(&pkt_dev->hh[0], pkt_dev->dst_mac);
1530 
1531                 sprintf(pg_result, "OK: dstmac %pM", pkt_dev->dst_mac);
1532                 return count;
1533         }
1534         if (!strcmp(name, "src_mac")) {
1535                 len = strn_len(&user_buffer[i], sizeof(valstr) - 1);
1536                 if (len < 0)
1537                         return len;
1538 
1539                 memset(valstr, 0, sizeof(valstr));
1540                 if (copy_from_user(valstr, &user_buffer[i], len))
1541                         return -EFAULT;
1542 
1543                 if (!mac_pton(valstr, pkt_dev->src_mac))
1544                         return -EINVAL;
1545                 /* Set up Src MAC */
1546                 ether_addr_copy(&pkt_dev->hh[6], pkt_dev->src_mac);
1547 
1548                 sprintf(pg_result, "OK: srcmac %pM", pkt_dev->src_mac);
1549                 return count;
1550         }
1551 
1552         if (!strcmp(name, "clear_counters")) {
1553                 pktgen_clear_counters(pkt_dev);
1554                 sprintf(pg_result, "OK: Clearing counters.\n");
1555                 return count;
1556         }
1557 
1558         if (!strcmp(name, "flows")) {
1559                 len = num_arg(&user_buffer[i], 10, &value);
1560                 if (len < 0)
1561                         return len;
1562 
1563                 i += len;
1564                 if (value > MAX_CFLOWS)
1565                         value = MAX_CFLOWS;
1566 
1567                 pkt_dev->cflows = value;
1568                 sprintf(pg_result, "OK: flows=%u", pkt_dev->cflows);
1569                 return count;
1570         }
1571 #ifdef CONFIG_XFRM
1572         if (!strcmp(name, "spi")) {
1573                 len = num_arg(&user_buffer[i], 10, &value);
1574                 if (len < 0)
1575                         return len;
1576 
1577                 i += len;
1578                 pkt_dev->spi = value;
1579                 sprintf(pg_result, "OK: spi=%u", pkt_dev->spi);
1580                 return count;
1581         }
1582 #endif
1583         if (!strcmp(name, "flowlen")) {
1584                 len = num_arg(&user_buffer[i], 10, &value);
1585                 if (len < 0)
1586                         return len;
1587 
1588                 i += len;
1589                 pkt_dev->lflow = value;
1590                 sprintf(pg_result, "OK: flowlen=%u", pkt_dev->lflow);
1591                 return count;
1592         }
1593 
1594         if (!strcmp(name, "queue_map_min")) {
1595                 len = num_arg(&user_buffer[i], 5, &value);
1596                 if (len < 0)
1597                         return len;
1598 
1599                 i += len;
1600                 pkt_dev->queue_map_min = value;
1601                 sprintf(pg_result, "OK: queue_map_min=%u", pkt_dev->queue_map_min);
1602                 return count;
1603         }
1604 
1605         if (!strcmp(name, "queue_map_max")) {
1606                 len = num_arg(&user_buffer[i], 5, &value);
1607                 if (len < 0)
1608                         return len;
1609 
1610                 i += len;
1611                 pkt_dev->queue_map_max = value;
1612                 sprintf(pg_result, "OK: queue_map_max=%u", pkt_dev->queue_map_max);
1613                 return count;
1614         }
1615 
1616         if (!strcmp(name, "mpls")) {
1617                 unsigned int n, cnt;
1618 
1619                 len = get_labels(&user_buffer[i], pkt_dev);
1620                 if (len < 0)
1621                         return len;
1622                 i += len;
1623                 cnt = sprintf(pg_result, "OK: mpls=");
1624                 for (n = 0; n < pkt_dev->nr_labels; n++)
1625                         cnt += sprintf(pg_result + cnt,
1626                                        "%08x%s", ntohl(pkt_dev->labels[n]),
1627                                        n == pkt_dev->nr_labels-1 ? "" : ",");
1628 
1629                 if (pkt_dev->nr_labels && pkt_dev->vlan_id != 0xffff) {
1630                         pkt_dev->vlan_id = 0xffff; /* turn off VLAN/SVLAN */
1631                         pkt_dev->svlan_id = 0xffff;
1632 
1633                         if (debug)
1634                                 pr_debug("VLAN/SVLAN auto turned off\n");
1635                 }
1636                 return count;
1637         }
1638 
1639         if (!strcmp(name, "vlan_id")) {
1640                 len = num_arg(&user_buffer[i], 4, &value);
1641                 if (len < 0)
1642                         return len;
1643 
1644                 i += len;
1645                 if (value <= 4095) {
1646                         pkt_dev->vlan_id = value;  /* turn on VLAN */
1647 
1648                         if (debug)
1649                                 pr_debug("VLAN turned on\n");
1650 
1651                         if (debug && pkt_dev->nr_labels)
1652                                 pr_debug("MPLS auto turned off\n");
1653 
1654                         pkt_dev->nr_labels = 0;    /* turn off MPLS */
1655                         sprintf(pg_result, "OK: vlan_id=%u", pkt_dev->vlan_id);
1656                 } else {
1657                         pkt_dev->vlan_id = 0xffff; /* turn off VLAN/SVLAN */
1658                         pkt_dev->svlan_id = 0xffff;
1659 
1660                         if (debug)
1661                                 pr_debug("VLAN/SVLAN turned off\n");
1662                 }
1663                 return count;
1664         }
1665 
1666         if (!strcmp(name, "vlan_p")) {
1667                 len = num_arg(&user_buffer[i], 1, &value);
1668                 if (len < 0)
1669                         return len;
1670 
1671                 i += len;
1672                 if ((value <= 7) && (pkt_dev->vlan_id != 0xffff)) {
1673                         pkt_dev->vlan_p = value;
1674                         sprintf(pg_result, "OK: vlan_p=%u", pkt_dev->vlan_p);
1675                 } else {
1676                         sprintf(pg_result, "ERROR: vlan_p must be 0-7");
1677                 }
1678                 return count;
1679         }
1680 
1681         if (!strcmp(name, "vlan_cfi")) {
1682                 len = num_arg(&user_buffer[i], 1, &value);
1683                 if (len < 0)
1684                         return len;
1685 
1686                 i += len;
1687                 if ((value <= 1) && (pkt_dev->vlan_id != 0xffff)) {
1688                         pkt_dev->vlan_cfi = value;
1689                         sprintf(pg_result, "OK: vlan_cfi=%u", pkt_dev->vlan_cfi);
1690                 } else {
1691                         sprintf(pg_result, "ERROR: vlan_cfi must be 0-1");
1692                 }
1693                 return count;
1694         }
1695 
1696         if (!strcmp(name, "svlan_id")) {
1697                 len = num_arg(&user_buffer[i], 4, &value);
1698                 if (len < 0)
1699                         return len;
1700 
1701                 i += len;
1702                 if ((value <= 4095) && ((pkt_dev->vlan_id != 0xffff))) {
1703                         pkt_dev->svlan_id = value;  /* turn on SVLAN */
1704 
1705                         if (debug)
1706                                 pr_debug("SVLAN turned on\n");
1707 
1708                         if (debug && pkt_dev->nr_labels)
1709                                 pr_debug("MPLS auto turned off\n");
1710 
1711                         pkt_dev->nr_labels = 0;    /* turn off MPLS */
1712                         sprintf(pg_result, "OK: svlan_id=%u", pkt_dev->svlan_id);
1713                 } else {
1714                         pkt_dev->vlan_id = 0xffff; /* turn off VLAN/SVLAN */
1715                         pkt_dev->svlan_id = 0xffff;
1716 
1717                         if (debug)
1718                                 pr_debug("VLAN/SVLAN turned off\n");
1719                 }
1720                 return count;
1721         }
1722 
1723         if (!strcmp(name, "svlan_p")) {
1724                 len = num_arg(&user_buffer[i], 1, &value);
1725                 if (len < 0)
1726                         return len;
1727 
1728                 i += len;
1729                 if ((value <= 7) && (pkt_dev->svlan_id != 0xffff)) {
1730                         pkt_dev->svlan_p = value;
1731                         sprintf(pg_result, "OK: svlan_p=%u", pkt_dev->svlan_p);
1732                 } else {
1733                         sprintf(pg_result, "ERROR: svlan_p must be 0-7");
1734                 }
1735                 return count;
1736         }
1737 
1738         if (!strcmp(name, "svlan_cfi")) {
1739                 len = num_arg(&user_buffer[i], 1, &value);
1740                 if (len < 0)
1741                         return len;
1742 
1743                 i += len;
1744                 if ((value <= 1) && (pkt_dev->svlan_id != 0xffff)) {
1745                         pkt_dev->svlan_cfi = value;
1746                         sprintf(pg_result, "OK: svlan_cfi=%u", pkt_dev->svlan_cfi);
1747                 } else {
1748                         sprintf(pg_result, "ERROR: svlan_cfi must be 0-1");
1749                 }
1750                 return count;
1751         }
1752 
1753         if (!strcmp(name, "tos")) {
1754                 __u32 tmp_value = 0;
1755                 len = hex32_arg(&user_buffer[i], 2, &tmp_value);
1756                 if (len < 0)
1757                         return len;
1758 
1759                 i += len;
1760                 if (len == 2) {
1761                         pkt_dev->tos = tmp_value;
1762                         sprintf(pg_result, "OK: tos=0x%02x", pkt_dev->tos);
1763                 } else {
1764                         sprintf(pg_result, "ERROR: tos must be 00-ff");
1765                 }
1766                 return count;
1767         }
1768 
1769         if (!strcmp(name, "traffic_class")) {
1770                 __u32 tmp_value = 0;
1771                 len = hex32_arg(&user_buffer[i], 2, &tmp_value);
1772                 if (len < 0)
1773                         return len;
1774 
1775                 i += len;
1776                 if (len == 2) {
1777                         pkt_dev->traffic_class = tmp_value;
1778                         sprintf(pg_result, "OK: traffic_class=0x%02x", pkt_dev->traffic_class);
1779                 } else {
1780                         sprintf(pg_result, "ERROR: traffic_class must be 00-ff");
1781                 }
1782                 return count;
1783         }
1784 
1785         if (!strcmp(name, "skb_priority")) {
1786                 len = num_arg(&user_buffer[i], 9, &value);
1787                 if (len < 0)
1788                         return len;
1789 
1790                 i += len;
1791                 pkt_dev->skb_priority = value;
1792                 sprintf(pg_result, "OK: skb_priority=%i",
1793                         pkt_dev->skb_priority);
1794                 return count;
1795         }
1796 
1797         sprintf(pkt_dev->result, "No such parameter \"%s\"", name);
1798         return -EINVAL;
1799 }
1800 
1801 static int pktgen_if_open(struct inode *inode, struct file *file)
1802 {
1803         return single_open(file, pktgen_if_show, PDE_DATA(inode));
1804 }
1805 
1806 static const struct file_operations pktgen_if_fops = {
1807         .owner   = THIS_MODULE,
1808         .open    = pktgen_if_open,
1809         .read    = seq_read,
1810         .llseek  = seq_lseek,
1811         .write   = pktgen_if_write,
1812         .release = single_release,
1813 };
1814 
1815 static int pktgen_thread_show(struct seq_file *seq, void *v)
1816 {
1817         struct pktgen_thread *t = seq->private;
1818         const struct pktgen_dev *pkt_dev;
1819 
1820         BUG_ON(!t);
1821 
1822         seq_puts(seq, "Running: ");
1823 
1824         rcu_read_lock();
1825         list_for_each_entry_rcu(pkt_dev, &t->if_list, list)
1826                 if (pkt_dev->running)
1827                         seq_printf(seq, "%s ", pkt_dev->odevname);
1828 
1829         seq_puts(seq, "\nStopped: ");
1830 
1831         list_for_each_entry_rcu(pkt_dev, &t->if_list, list)
1832                 if (!pkt_dev->running)
1833                         seq_printf(seq, "%s ", pkt_dev->odevname);
1834 
1835         if (t->result[0])
1836                 seq_printf(seq, "\nResult: %s\n", t->result);
1837         else
1838                 seq_puts(seq, "\nResult: NA\n");
1839 
1840         rcu_read_unlock();
1841 
1842         return 0;
1843 }
1844 
1845 static ssize_t pktgen_thread_write(struct file *file,
1846                                    const char __user * user_buffer,
1847                                    size_t count, loff_t * offset)
1848 {
1849         struct seq_file *seq = file->private_data;
1850         struct pktgen_thread *t = seq->private;
1851         int i, max, len, ret;
1852         char name[40];
1853         char *pg_result;
1854 
1855         if (count < 1) {
1856                 //      sprintf(pg_result, "Wrong command format");
1857                 return -EINVAL;
1858         }
1859 
1860         max = count;
1861         len = count_trail_chars(user_buffer, max);
1862         if (len < 0)
1863                 return len;
1864 
1865         i = len;
1866 
1867         /* Read variable name */
1868 
1869         len = strn_len(&user_buffer[i], sizeof(name) - 1);
1870         if (len < 0)
1871                 return len;
1872 
1873         memset(name, 0, sizeof(name));
1874         if (copy_from_user(name, &user_buffer[i], len))
1875                 return -EFAULT;
1876         i += len;
1877 
1878         max = count - i;
1879         len = count_trail_chars(&user_buffer[i], max);
1880         if (len < 0)
1881                 return len;
1882 
1883         i += len;
1884 
1885         if (debug)
1886                 pr_debug("t=%s, count=%lu\n", name, (unsigned long)count);
1887 
1888         if (!t) {
1889                 pr_err("ERROR: No thread\n");
1890                 ret = -EINVAL;
1891                 goto out;
1892         }
1893 
1894         pg_result = &(t->result[0]);
1895 
1896         if (!strcmp(name, "add_device")) {
1897                 char f[32];
1898                 memset(f, 0, 32);
1899                 len = strn_len(&user_buffer[i], sizeof(f) - 1);
1900                 if (len < 0) {
1901                         ret = len;
1902                         goto out;
1903                 }
1904                 if (copy_from_user(f, &user_buffer[i], len))
1905                         return -EFAULT;
1906                 i += len;
1907                 mutex_lock(&pktgen_thread_lock);
1908                 ret = pktgen_add_device(t, f);
1909                 mutex_unlock(&pktgen_thread_lock);
1910                 if (!ret) {
1911                         ret = count;
1912                         sprintf(pg_result, "OK: add_device=%s", f);
1913                 } else
1914                         sprintf(pg_result, "ERROR: can not add device %s", f);
1915                 goto out;
1916         }
1917 
1918         if (!strcmp(name, "rem_device_all")) {
1919                 mutex_lock(&pktgen_thread_lock);
1920                 t->control |= T_REMDEVALL;
1921                 mutex_unlock(&pktgen_thread_lock);
1922                 schedule_timeout_interruptible(msecs_to_jiffies(125));  /* Propagate thread->control  */
1923                 ret = count;
1924                 sprintf(pg_result, "OK: rem_device_all");
1925                 goto out;
1926         }
1927 
1928         if (!strcmp(name, "max_before_softirq")) {
1929                 sprintf(pg_result, "OK: Note! max_before_softirq is obsoleted -- Do not use");
1930                 ret = count;
1931                 goto out;
1932         }
1933 
1934         ret = -EINVAL;
1935 out:
1936         return ret;
1937 }
1938 
1939 static int pktgen_thread_open(struct inode *inode, struct file *file)
1940 {
1941         return single_open(file, pktgen_thread_show, PDE_DATA(inode));
1942 }
1943 
1944 static const struct file_operations pktgen_thread_fops = {
1945         .owner   = THIS_MODULE,
1946         .open    = pktgen_thread_open,
1947         .read    = seq_read,
1948         .llseek  = seq_lseek,
1949         .write   = pktgen_thread_write,
1950         .release = single_release,
1951 };
1952 
1953 /* Think find or remove for NN */
1954 static struct pktgen_dev *__pktgen_NN_threads(const struct pktgen_net *pn,
1955                                               const char *ifname, int remove)
1956 {
1957         struct pktgen_thread *t;
1958         struct pktgen_dev *pkt_dev = NULL;
1959         bool exact = (remove == FIND);
1960 
1961         list_for_each_entry(t, &pn->pktgen_threads, th_list) {
1962                 pkt_dev = pktgen_find_dev(t, ifname, exact);
1963                 if (pkt_dev) {
1964                         if (remove) {
1965                                 pkt_dev->removal_mark = 1;
1966                                 t->control |= T_REMDEV;
1967                         }
1968                         break;
1969                 }
1970         }
1971         return pkt_dev;
1972 }
1973 
1974 /*
1975  * mark a device for removal
1976  */
1977 static void pktgen_mark_device(const struct pktgen_net *pn, const char *ifname)
1978 {
1979         struct pktgen_dev *pkt_dev = NULL;
1980         const int max_tries = 10, msec_per_try = 125;
1981         int i = 0;
1982 
1983         mutex_lock(&pktgen_thread_lock);
1984         pr_debug("%s: marking %s for removal\n", __func__, ifname);
1985 
1986         while (1) {
1987 
1988                 pkt_dev = __pktgen_NN_threads(pn, ifname, REMOVE);
1989                 if (pkt_dev == NULL)
1990                         break;  /* success */
1991 
1992                 mutex_unlock(&pktgen_thread_lock);
1993                 pr_debug("%s: waiting for %s to disappear....\n",
1994                          __func__, ifname);
1995                 schedule_timeout_interruptible(msecs_to_jiffies(msec_per_try));
1996                 mutex_lock(&pktgen_thread_lock);
1997 
1998                 if (++i >= max_tries) {
1999                         pr_err("%s: timed out after waiting %d msec for device %s to be removed\n",
2000                                __func__, msec_per_try * i, ifname);
2001                         break;
2002                 }
2003 
2004         }
2005 
2006         mutex_unlock(&pktgen_thread_lock);
2007 }
2008 
2009 static void pktgen_change_name(const struct pktgen_net *pn, struct net_device *dev)
2010 {
2011         struct pktgen_thread *t;
2012 
2013         mutex_lock(&pktgen_thread_lock);
2014 
2015         list_for_each_entry(t, &pn->pktgen_threads, th_list) {
2016                 struct pktgen_dev *pkt_dev;
2017 
2018                 if_lock(t);
2019                 list_for_each_entry(pkt_dev, &t->if_list, list) {
2020                         if (pkt_dev->odev != dev)
2021                                 continue;
2022 
2023                         proc_remove(pkt_dev->entry);
2024 
2025                         pkt_dev->entry = proc_create_data(dev->name, 0600,
2026                                                           pn->proc_dir,
2027                                                           &pktgen_if_fops,
2028                                                           pkt_dev);
2029                         if (!pkt_dev->entry)
2030                                 pr_err("can't move proc entry for '%s'\n",
2031                                        dev->name);
2032                         break;
2033                 }
2034                 if_unlock(t);
2035         }
2036         mutex_unlock(&pktgen_thread_lock);
2037 }
2038 
2039 static int pktgen_device_event(struct notifier_block *unused,
2040                                unsigned long event, void *ptr)
2041 {
2042         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2043         struct pktgen_net *pn = net_generic(dev_net(dev), pg_net_id);
2044 
2045         if (pn->pktgen_exiting)
2046                 return NOTIFY_DONE;
2047 
2048         /* It is OK that we do not hold the group lock right now,
2049          * as we run under the RTNL lock.
2050          */
2051 
2052         switch (event) {
2053         case NETDEV_CHANGENAME:
2054                 pktgen_change_name(pn, dev);
2055                 break;
2056 
2057         case NETDEV_UNREGISTER:
2058                 pktgen_mark_device(pn, dev->name);
2059                 break;
2060         }
2061 
2062         return NOTIFY_DONE;
2063 }
2064 
2065 static struct net_device *pktgen_dev_get_by_name(const struct pktgen_net *pn,
2066                                                  struct pktgen_dev *pkt_dev,
2067                                                  const char *ifname)
2068 {
2069         char b[IFNAMSIZ+5];
2070         int i;
2071 
2072         for (i = 0; ifname[i] != '@'; i++) {
2073                 if (i == IFNAMSIZ)
2074                         break;
2075 
2076                 b[i] = ifname[i];
2077         }
2078         b[i] = 0;
2079 
2080         return dev_get_by_name(pn->net, b);
2081 }
2082 
2083 
2084 /* Associate pktgen_dev with a device. */
2085 
2086 static int pktgen_setup_dev(const struct pktgen_net *pn,
2087                             struct pktgen_dev *pkt_dev, const char *ifname)
2088 {
2089         struct net_device *odev;
2090         int err;
2091 
2092         /* Clean old setups */
2093         if (pkt_dev->odev) {
2094                 dev_put(pkt_dev->odev);
2095                 pkt_dev->odev = NULL;
2096         }
2097 
2098         odev = pktgen_dev_get_by_name(pn, pkt_dev, ifname);
2099         if (!odev) {
2100                 pr_err("no such netdevice: \"%s\"\n", ifname);
2101                 return -ENODEV;
2102         }
2103 
2104         if (odev->type != ARPHRD_ETHER) {
2105                 pr_err("not an ethernet device: \"%s\"\n", ifname);
2106                 err = -EINVAL;
2107         } else if (!netif_running(odev)) {
2108                 pr_err("device is down: \"%s\"\n", ifname);
2109                 err = -ENETDOWN;
2110         } else {
2111                 pkt_dev->odev = odev;
2112                 return 0;
2113         }
2114 
2115         dev_put(odev);
2116         return err;
2117 }
2118 
2119 /* Read pkt_dev from the interface and set up internal pktgen_dev
2120  * structure to have the right information to create/send packets
2121  */
2122 static void pktgen_setup_inject(struct pktgen_dev *pkt_dev)
2123 {
2124         int ntxq;
2125 
2126         if (!pkt_dev->odev) {
2127                 pr_err("ERROR: pkt_dev->odev == NULL in setup_inject\n");
2128                 sprintf(pkt_dev->result,
2129                         "ERROR: pkt_dev->odev == NULL in setup_inject.\n");
2130                 return;
2131         }
2132 
2133         /* make sure that we don't pick a non-existing transmit queue */
2134         ntxq = pkt_dev->odev->real_num_tx_queues;
2135 
2136         if (ntxq <= pkt_dev->queue_map_min) {
2137                 pr_warn("WARNING: Requested queue_map_min (zero-based) (%d) exceeds valid range [0 - %d] for (%d) queues on %s, resetting\n",
2138                         pkt_dev->queue_map_min, (ntxq ?: 1) - 1, ntxq,
2139                         pkt_dev->odevname);
2140                 pkt_dev->queue_map_min = (ntxq ?: 1) - 1;
2141         }
2142         if (pkt_dev->queue_map_max >= ntxq) {
2143                 pr_warn("WARNING: Requested queue_map_max (zero-based) (%d) exceeds valid range [0 - %d] for (%d) queues on %s, resetting\n",
2144                         pkt_dev->queue_map_max, (ntxq ?: 1) - 1, ntxq,
2145                         pkt_dev->odevname);
2146                 pkt_dev->queue_map_max = (ntxq ?: 1) - 1;
2147         }
2148 
2149         /* Default to the interface's mac if not explicitly set. */
2150 
2151         if (is_zero_ether_addr(pkt_dev->src_mac))
2152                 ether_addr_copy(&(pkt_dev->hh[6]), pkt_dev->odev->dev_addr);
2153 
2154         /* Set up Dest MAC */
2155         ether_addr_copy(&(pkt_dev->hh[0]), pkt_dev->dst_mac);
2156 
2157         if (pkt_dev->flags & F_IPV6) {
2158                 int i, set = 0, err = 1;
2159                 struct inet6_dev *idev;
2160 
2161                 if (pkt_dev->min_pkt_size == 0) {
2162                         pkt_dev->min_pkt_size = 14 + sizeof(struct ipv6hdr)
2163                                                 + sizeof(struct udphdr)
2164                                                 + sizeof(struct pktgen_hdr)
2165                                                 + pkt_dev->pkt_overhead;
2166                 }
2167 
2168                 for (i = 0; i < IN6_ADDR_HSIZE; i++)
2169                         if (pkt_dev->cur_in6_saddr.s6_addr[i]) {
2170                                 set = 1;
2171                                 break;
2172                         }
2173 
2174                 if (!set) {
2175 
2176                         /*
2177                          * Use linklevel address if unconfigured.
2178                          *
2179                          * use ipv6_get_lladdr if/when it's get exported
2180                          */
2181 
2182                         rcu_read_lock();
2183                         idev = __in6_dev_get(pkt_dev->odev);
2184                         if (idev) {
2185                                 struct inet6_ifaddr *ifp;
2186 
2187                                 read_lock_bh(&idev->lock);
2188                                 list_for_each_entry(ifp, &idev->addr_list, if_list) {
2189                                         if ((ifp->scope & IFA_LINK) &&
2190                                             !(ifp->flags & IFA_F_TENTATIVE)) {
2191                                                 pkt_dev->cur_in6_saddr = ifp->addr;
2192                                                 err = 0;
2193                                                 break;
2194                                         }
2195                                 }
2196                                 read_unlock_bh(&idev->lock);
2197                         }
2198                         rcu_read_unlock();
2199                         if (err)
2200                                 pr_err("ERROR: IPv6 link address not available\n");
2201                 }
2202         } else {
2203                 if (pkt_dev->min_pkt_size == 0) {
2204                         pkt_dev->min_pkt_size = 14 + sizeof(struct iphdr)
2205                                                 + sizeof(struct udphdr)
2206                                                 + sizeof(struct pktgen_hdr)
2207                                                 + pkt_dev->pkt_overhead;
2208                 }
2209 
2210                 pkt_dev->saddr_min = 0;
2211                 pkt_dev->saddr_max = 0;
2212                 if (strlen(pkt_dev->src_min) == 0) {
2213 
2214                         struct in_device *in_dev;
2215 
2216                         rcu_read_lock();
2217                         in_dev = __in_dev_get_rcu(pkt_dev->odev);
2218                         if (in_dev) {
2219                                 if (in_dev->ifa_list) {
2220                                         pkt_dev->saddr_min =
2221                                             in_dev->ifa_list->ifa_address;
2222                                         pkt_dev->saddr_max = pkt_dev->saddr_min;
2223                                 }
2224                         }
2225                         rcu_read_unlock();
2226                 } else {
2227                         pkt_dev->saddr_min = in_aton(pkt_dev->src_min);
2228                         pkt_dev->saddr_max = in_aton(pkt_dev->src_max);
2229                 }
2230 
2231                 pkt_dev->daddr_min = in_aton(pkt_dev->dst_min);
2232                 pkt_dev->daddr_max = in_aton(pkt_dev->dst_max);
2233         }
2234         /* Initialize current values. */
2235         pkt_dev->cur_pkt_size = pkt_dev->min_pkt_size;
2236         if (pkt_dev->min_pkt_size > pkt_dev->max_pkt_size)
2237                 pkt_dev->max_pkt_size = pkt_dev->min_pkt_size;
2238 
2239         pkt_dev->cur_dst_mac_offset = 0;
2240         pkt_dev->cur_src_mac_offset = 0;
2241         pkt_dev->cur_saddr = pkt_dev->saddr_min;
2242         pkt_dev->cur_daddr = pkt_dev->daddr_min;
2243         pkt_dev->cur_udp_dst = pkt_dev->udp_dst_min;
2244         pkt_dev->cur_udp_src = pkt_dev->udp_src_min;
2245         pkt_dev->nflows = 0;
2246 }
2247 
2248 
2249 static void spin(struct pktgen_dev *pkt_dev, ktime_t spin_until)
2250 {
2251         ktime_t start_time, end_time;
2252         s64 remaining;
2253         struct hrtimer_sleeper t;
2254 
2255         hrtimer_init_on_stack(&t.timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
2256         hrtimer_set_expires(&t.timer, spin_until);
2257 
2258         remaining = ktime_to_ns(hrtimer_expires_remaining(&t.timer));
2259         if (remaining <= 0)
2260                 goto out;
2261 
2262         start_time = ktime_get();
2263         if (remaining < 100000) {
2264                 /* for small delays (<100us), just loop until limit is reached */
2265                 do {
2266                         end_time = ktime_get();
2267                 } while (ktime_compare(end_time, spin_until) < 0);
2268         } else {
2269                 /* see do_nanosleep */
2270                 hrtimer_init_sleeper(&t, current);
2271                 do {
2272                         set_current_state(TASK_INTERRUPTIBLE);
2273                         hrtimer_start_expires(&t.timer, HRTIMER_MODE_ABS);
2274 
2275                         if (likely(t.task))
2276                                 schedule();
2277 
2278                         hrtimer_cancel(&t.timer);
2279                 } while (t.task && pkt_dev->running && !signal_pending(current));
2280                 __set_current_state(TASK_RUNNING);
2281                 end_time = ktime_get();
2282         }
2283 
2284         pkt_dev->idle_acc += ktime_to_ns(ktime_sub(end_time, start_time));
2285 out:
2286         pkt_dev->next_tx = ktime_add_ns(spin_until, pkt_dev->delay);
2287         destroy_hrtimer_on_stack(&t.timer);
2288 }
2289 
2290 static inline void set_pkt_overhead(struct pktgen_dev *pkt_dev)
2291 {
2292         pkt_dev->pkt_overhead = 0;
2293         pkt_dev->pkt_overhead += pkt_dev->nr_labels*sizeof(u32);
2294         pkt_dev->pkt_overhead += VLAN_TAG_SIZE(pkt_dev);
2295         pkt_dev->pkt_overhead += SVLAN_TAG_SIZE(pkt_dev);
2296 }
2297 
2298 static inline int f_seen(const struct pktgen_dev *pkt_dev, int flow)
2299 {
2300         return !!(pkt_dev->flows[flow].flags & F_INIT);
2301 }
2302 
2303 static inline int f_pick(struct pktgen_dev *pkt_dev)
2304 {
2305         int flow = pkt_dev->curfl;
2306 
2307         if (pkt_dev->flags & F_FLOW_SEQ) {
2308                 if (pkt_dev->flows[flow].count >= pkt_dev->lflow) {
2309                         /* reset time */
2310                         pkt_dev->flows[flow].count = 0;
2311                         pkt_dev->flows[flow].flags = 0;
2312                         pkt_dev->curfl += 1;
2313                         if (pkt_dev->curfl >= pkt_dev->cflows)
2314                                 pkt_dev->curfl = 0; /*reset */
2315                 }
2316         } else {
2317                 flow = prandom_u32() % pkt_dev->cflows;
2318                 pkt_dev->curfl = flow;
2319 
2320                 if (pkt_dev->flows[flow].count > pkt_dev->lflow) {
2321                         pkt_dev->flows[flow].count = 0;
2322                         pkt_dev->flows[flow].flags = 0;
2323                 }
2324         }
2325 
2326         return pkt_dev->curfl;
2327 }
2328 
2329 
2330 #ifdef CONFIG_XFRM
2331 /* If there was already an IPSEC SA, we keep it as is, else
2332  * we go look for it ...
2333 */
2334 #define DUMMY_MARK 0
2335 static void get_ipsec_sa(struct pktgen_dev *pkt_dev, int flow)
2336 {
2337         struct xfrm_state *x = pkt_dev->flows[flow].x;
2338         struct pktgen_net *pn = net_generic(dev_net(pkt_dev->odev), pg_net_id);
2339         if (!x) {
2340 
2341                 if (pkt_dev->spi) {
2342                         /* We need as quick as possible to find the right SA
2343                          * Searching with minimum criteria to archieve this.
2344                          */
2345                         x = xfrm_state_lookup_byspi(pn->net, htonl(pkt_dev->spi), AF_INET);
2346                 } else {
2347                         /* slow path: we dont already have xfrm_state */
2348                         x = xfrm_stateonly_find(pn->net, DUMMY_MARK,
2349                                                 (xfrm_address_t *)&pkt_dev->cur_daddr,
2350                                                 (xfrm_address_t *)&pkt_dev->cur_saddr,
2351                                                 AF_INET,
2352                                                 pkt_dev->ipsmode,
2353                                                 pkt_dev->ipsproto, 0);
2354                 }
2355                 if (x) {
2356                         pkt_dev->flows[flow].x = x;
2357                         set_pkt_overhead(pkt_dev);
2358                         pkt_dev->pkt_overhead += x->props.header_len;
2359                 }
2360 
2361         }
2362 }
2363 #endif
2364 static void set_cur_queue_map(struct pktgen_dev *pkt_dev)
2365 {
2366 
2367         if (pkt_dev->flags & F_QUEUE_MAP_CPU)
2368                 pkt_dev->cur_queue_map = smp_processor_id();
2369 
2370         else if (pkt_dev->queue_map_min <= pkt_dev->queue_map_max) {
2371                 __u16 t;
2372                 if (pkt_dev->flags & F_QUEUE_MAP_RND) {
2373                         t = prandom_u32() %
2374                                 (pkt_dev->queue_map_max -
2375                                  pkt_dev->queue_map_min + 1)
2376                                 + pkt_dev->queue_map_min;
2377                 } else {
2378                         t = pkt_dev->cur_queue_map + 1;
2379                         if (t > pkt_dev->queue_map_max)
2380                                 t = pkt_dev->queue_map_min;
2381                 }
2382                 pkt_dev->cur_queue_map = t;
2383         }
2384         pkt_dev->cur_queue_map  = pkt_dev->cur_queue_map % pkt_dev->odev->real_num_tx_queues;
2385 }
2386 
2387 /* Increment/randomize headers according to flags and current values
2388  * for IP src/dest, UDP src/dst port, MAC-Addr src/dst
2389  */
2390 static void mod_cur_headers(struct pktgen_dev *pkt_dev)
2391 {
2392         __u32 imn;
2393         __u32 imx;
2394         int flow = 0;
2395 
2396         if (pkt_dev->cflows)
2397                 flow = f_pick(pkt_dev);
2398 
2399         /*  Deal with source MAC */
2400         if (pkt_dev->src_mac_count > 1) {
2401                 __u32 mc;
2402                 __u32 tmp;
2403 
2404                 if (pkt_dev->flags & F_MACSRC_RND)
2405                         mc = prandom_u32() % pkt_dev->src_mac_count;
2406                 else {
2407                         mc = pkt_dev->cur_src_mac_offset++;
2408                         if (pkt_dev->cur_src_mac_offset >=
2409                             pkt_dev->src_mac_count)
2410                                 pkt_dev->cur_src_mac_offset = 0;
2411                 }
2412 
2413                 tmp = pkt_dev->src_mac[5] + (mc & 0xFF);
2414                 pkt_dev->hh[11] = tmp;
2415                 tmp = (pkt_dev->src_mac[4] + ((mc >> 8) & 0xFF) + (tmp >> 8));
2416                 pkt_dev->hh[10] = tmp;
2417                 tmp = (pkt_dev->src_mac[3] + ((mc >> 16) & 0xFF) + (tmp >> 8));
2418                 pkt_dev->hh[9] = tmp;
2419                 tmp = (pkt_dev->src_mac[2] + ((mc >> 24) & 0xFF) + (tmp >> 8));
2420                 pkt_dev->hh[8] = tmp;
2421                 tmp = (pkt_dev->src_mac[1] + (tmp >> 8));
2422                 pkt_dev->hh[7] = tmp;
2423         }
2424 
2425         /*  Deal with Destination MAC */
2426         if (pkt_dev->dst_mac_count > 1) {
2427                 __u32 mc;
2428                 __u32 tmp;
2429 
2430                 if (pkt_dev->flags & F_MACDST_RND)
2431                         mc = prandom_u32() % pkt_dev->dst_mac_count;
2432 
2433                 else {
2434                         mc = pkt_dev->cur_dst_mac_offset++;
2435                         if (pkt_dev->cur_dst_mac_offset >=
2436                             pkt_dev->dst_mac_count) {
2437                                 pkt_dev->cur_dst_mac_offset = 0;
2438                         }
2439                 }
2440 
2441                 tmp = pkt_dev->dst_mac[5] + (mc & 0xFF);
2442                 pkt_dev->hh[5] = tmp;
2443                 tmp = (pkt_dev->dst_mac[4] + ((mc >> 8) & 0xFF) + (tmp >> 8));
2444                 pkt_dev->hh[4] = tmp;
2445                 tmp = (pkt_dev->dst_mac[3] + ((mc >> 16) & 0xFF) + (tmp >> 8));
2446                 pkt_dev->hh[3] = tmp;
2447                 tmp = (pkt_dev->dst_mac[2] + ((mc >> 24) & 0xFF) + (tmp >> 8));
2448                 pkt_dev->hh[2] = tmp;
2449                 tmp = (pkt_dev->dst_mac[1] + (tmp >> 8));
2450                 pkt_dev->hh[1] = tmp;
2451         }
2452 
2453         if (pkt_dev->flags & F_MPLS_RND) {
2454                 unsigned int i;
2455                 for (i = 0; i < pkt_dev->nr_labels; i++)
2456                         if (pkt_dev->labels[i] & MPLS_STACK_BOTTOM)
2457                                 pkt_dev->labels[i] = MPLS_STACK_BOTTOM |
2458                                              ((__force __be32)prandom_u32() &
2459                                                       htonl(0x000fffff));
2460         }
2461 
2462         if ((pkt_dev->flags & F_VID_RND) && (pkt_dev->vlan_id != 0xffff)) {
2463                 pkt_dev->vlan_id = prandom_u32() & (4096 - 1);
2464         }
2465 
2466         if ((pkt_dev->flags & F_SVID_RND) && (pkt_dev->svlan_id != 0xffff)) {
2467                 pkt_dev->svlan_id = prandom_u32() & (4096 - 1);
2468         }
2469 
2470         if (pkt_dev->udp_src_min < pkt_dev->udp_src_max) {
2471                 if (pkt_dev->flags & F_UDPSRC_RND)
2472                         pkt_dev->cur_udp_src = prandom_u32() %
2473                                 (pkt_dev->udp_src_max - pkt_dev->udp_src_min)
2474                                 + pkt_dev->udp_src_min;
2475 
2476                 else {
2477                         pkt_dev->cur_udp_src++;
2478                         if (pkt_dev->cur_udp_src >= pkt_dev->udp_src_max)
2479                                 pkt_dev->cur_udp_src = pkt_dev->udp_src_min;
2480                 }
2481         }
2482 
2483         if (pkt_dev->udp_dst_min < pkt_dev->udp_dst_max) {
2484                 if (pkt_dev->flags & F_UDPDST_RND) {
2485                         pkt_dev->cur_udp_dst = prandom_u32() %
2486                                 (pkt_dev->udp_dst_max - pkt_dev->udp_dst_min)
2487                                 + pkt_dev->udp_dst_min;
2488                 } else {
2489                         pkt_dev->cur_udp_dst++;
2490                         if (pkt_dev->cur_udp_dst >= pkt_dev->udp_dst_max)
2491                                 pkt_dev->cur_udp_dst = pkt_dev->udp_dst_min;
2492                 }
2493         }
2494 
2495         if (!(pkt_dev->flags & F_IPV6)) {
2496 
2497                 imn = ntohl(pkt_dev->saddr_min);
2498                 imx = ntohl(pkt_dev->saddr_max);
2499                 if (imn < imx) {
2500                         __u32 t;
2501                         if (pkt_dev->flags & F_IPSRC_RND)
2502                                 t = prandom_u32() % (imx - imn) + imn;
2503                         else {
2504                                 t = ntohl(pkt_dev->cur_saddr);
2505                                 t++;
2506                                 if (t > imx)
2507                                         t = imn;
2508 
2509                         }
2510                         pkt_dev->cur_saddr = htonl(t);
2511                 }
2512 
2513                 if (pkt_dev->cflows && f_seen(pkt_dev, flow)) {
2514                         pkt_dev->cur_daddr = pkt_dev->flows[flow].cur_daddr;
2515                 } else {
2516                         imn = ntohl(pkt_dev->daddr_min);
2517                         imx = ntohl(pkt_dev->daddr_max);
2518                         if (imn < imx) {
2519                                 __u32 t;
2520                                 __be32 s;
2521                                 if (pkt_dev->flags & F_IPDST_RND) {
2522 
2523                                         do {
2524                                                 t = prandom_u32() %
2525                                                         (imx - imn) + imn;
2526                                                 s = htonl(t);
2527                                         } while (ipv4_is_loopback(s) ||
2528                                                 ipv4_is_multicast(s) ||
2529                                                 ipv4_is_lbcast(s) ||
2530                                                 ipv4_is_zeronet(s) ||
2531                                                 ipv4_is_local_multicast(s));
2532                                         pkt_dev->cur_daddr = s;
2533                                 } else {
2534                                         t = ntohl(pkt_dev->cur_daddr);
2535                                         t++;
2536                                         if (t > imx) {
2537                                                 t = imn;
2538                                         }
2539                                         pkt_dev->cur_daddr = htonl(t);
2540                                 }
2541                         }
2542                         if (pkt_dev->cflows) {
2543                                 pkt_dev->flows[flow].flags |= F_INIT;
2544                                 pkt_dev->flows[flow].cur_daddr =
2545                                     pkt_dev->cur_daddr;
2546 #ifdef CONFIG_XFRM
2547                                 if (pkt_dev->flags & F_IPSEC_ON)
2548                                         get_ipsec_sa(pkt_dev, flow);
2549 #endif
2550                                 pkt_dev->nflows++;
2551                         }
2552                 }
2553         } else {                /* IPV6 * */
2554 
2555                 if (!ipv6_addr_any(&pkt_dev->min_in6_daddr)) {
2556                         int i;
2557 
2558                         /* Only random destinations yet */
2559 
2560                         for (i = 0; i < 4; i++) {
2561                                 pkt_dev->cur_in6_daddr.s6_addr32[i] =
2562                                     (((__force __be32)prandom_u32() |
2563                                       pkt_dev->min_in6_daddr.s6_addr32[i]) &
2564                                      pkt_dev->max_in6_daddr.s6_addr32[i]);
2565                         }
2566                 }
2567         }
2568 
2569         if (pkt_dev->min_pkt_size < pkt_dev->max_pkt_size) {
2570                 __u32 t;
2571                 if (pkt_dev->flags & F_TXSIZE_RND) {
2572                         t = prandom_u32() %
2573                                 (pkt_dev->max_pkt_size - pkt_dev->min_pkt_size)
2574                                 + pkt_dev->min_pkt_size;
2575                 } else {
2576                         t = pkt_dev->cur_pkt_size + 1;
2577                         if (t > pkt_dev->max_pkt_size)
2578                                 t = pkt_dev->min_pkt_size;
2579                 }
2580                 pkt_dev->cur_pkt_size = t;
2581         }
2582 
2583         set_cur_queue_map(pkt_dev);
2584 
2585         pkt_dev->flows[flow].count++;
2586 }
2587 
2588 
2589 #ifdef CONFIG_XFRM
2590 static u32 pktgen_dst_metrics[RTAX_MAX + 1] = {
2591 
2592         [RTAX_HOPLIMIT] = 0x5, /* Set a static hoplimit */
2593 };
2594 
2595 static int pktgen_output_ipsec(struct sk_buff *skb, struct pktgen_dev *pkt_dev)
2596 {
2597         struct xfrm_state *x = pkt_dev->flows[pkt_dev->curfl].x;
2598         int err = 0;
2599         struct net *net = dev_net(pkt_dev->odev);
2600 
2601         if (!x)
2602                 return 0;
2603         /* XXX: we dont support tunnel mode for now until
2604          * we resolve the dst issue */
2605         if ((x->props.mode != XFRM_MODE_TRANSPORT) && (pkt_dev->spi == 0))
2606                 return 0;
2607 
2608         /* But when user specify an valid SPI, transformation
2609          * supports both transport/tunnel mode + ESP/AH type.
2610          */
2611         if ((x->props.mode == XFRM_MODE_TUNNEL) && (pkt_dev->spi != 0))
2612                 skb->_skb_refdst = (unsigned long)&pkt_dev->dst | SKB_DST_NOREF;
2613 
2614         rcu_read_lock_bh();
2615         err = x->outer_mode->output(x, skb);
2616         rcu_read_unlock_bh();
2617         if (err) {
2618                 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTSTATEMODEERROR);
2619                 goto error;
2620         }
2621         err = x->type->output(x, skb);
2622         if (err) {
2623                 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTSTATEPROTOERROR);
2624                 goto error;
2625         }
2626         spin_lock_bh(&x->lock);
2627         x->curlft.bytes += skb->len;
2628         x->curlft.packets++;
2629         spin_unlock_bh(&x->lock);
2630 error:
2631         return err;
2632 }
2633 
2634 static void free_SAs(struct pktgen_dev *pkt_dev)
2635 {
2636         if (pkt_dev->cflows) {
2637                 /* let go of the SAs if we have them */
2638                 int i;
2639                 for (i = 0; i < pkt_dev->cflows; i++) {
2640                         struct xfrm_state *x = pkt_dev->flows[i].x;
2641                         if (x) {
2642                                 xfrm_state_put(x);
2643                                 pkt_dev->flows[i].x = NULL;
2644                         }
2645                 }
2646         }
2647 }
2648 
2649 static int process_ipsec(struct pktgen_dev *pkt_dev,
2650                               struct sk_buff *skb, __be16 protocol)
2651 {
2652         if (pkt_dev->flags & F_IPSEC_ON) {
2653                 struct xfrm_state *x = pkt_dev->flows[pkt_dev->curfl].x;
2654                 int nhead = 0;
2655                 if (x) {
2656                         struct ethhdr *eth;
2657                         struct iphdr *iph;
2658                         int ret;
2659 
2660                         nhead = x->props.header_len - skb_headroom(skb);
2661                         if (nhead > 0) {
2662                                 ret = pskb_expand_head(skb, nhead, 0, GFP_ATOMIC);
2663                                 if (ret < 0) {
2664                                         pr_err("Error expanding ipsec packet %d\n",
2665                                                ret);
2666                                         goto err;
2667                                 }
2668                         }
2669 
2670                         /* ipsec is not expecting ll header */
2671                         skb_pull(skb, ETH_HLEN);
2672                         ret = pktgen_output_ipsec(skb, pkt_dev);
2673                         if (ret) {
2674                                 pr_err("Error creating ipsec packet %d\n", ret);
2675                                 goto err;
2676                         }
2677                         /* restore ll */
2678                         eth = (struct ethhdr *)skb_push(skb, ETH_HLEN);
2679                         memcpy(eth, pkt_dev->hh, 2 * ETH_ALEN);
2680                         eth->h_proto = protocol;
2681 
2682                         /* Update IPv4 header len as well as checksum value */
2683                         iph = ip_hdr(skb);
2684                         iph->tot_len = htons(skb->len - ETH_HLEN);
2685                         ip_send_check(iph);
2686                 }
2687         }
2688         return 1;
2689 err:
2690         kfree_skb(skb);
2691         return 0;
2692 }
2693 #endif
2694 
2695 static void mpls_push(__be32 *mpls, struct pktgen_dev *pkt_dev)
2696 {
2697         unsigned int i;
2698         for (i = 0; i < pkt_dev->nr_labels; i++)
2699                 *mpls++ = pkt_dev->labels[i] & ~MPLS_STACK_BOTTOM;
2700 
2701         mpls--;
2702         *mpls |= MPLS_STACK_BOTTOM;
2703 }
2704 
2705 static inline __be16 build_tci(unsigned int id, unsigned int cfi,
2706                                unsigned int prio)
2707 {
2708         return htons(id | (cfi << 12) | (prio << 13));
2709 }
2710 
2711 static void pktgen_finalize_skb(struct pktgen_dev *pkt_dev, struct sk_buff *skb,
2712                                 int datalen)
2713 {
2714         struct timeval timestamp;
2715         struct pktgen_hdr *pgh;
2716 
2717         pgh = (struct pktgen_hdr *)skb_put(skb, sizeof(*pgh));
2718         datalen -= sizeof(*pgh);
2719 
2720         if (pkt_dev->nfrags <= 0) {
2721                 memset(skb_put(skb, datalen), 0, datalen);
2722         } else {
2723                 int frags = pkt_dev->nfrags;
2724                 int i, len;
2725                 int frag_len;
2726 
2727 
2728                 if (frags > MAX_SKB_FRAGS)
2729                         frags = MAX_SKB_FRAGS;
2730                 len = datalen - frags * PAGE_SIZE;
2731                 if (len > 0) {
2732                         memset(skb_put(skb, len), 0, len);
2733                         datalen = frags * PAGE_SIZE;
2734                 }
2735 
2736                 i = 0;
2737                 frag_len = (datalen/frags) < PAGE_SIZE ?
2738                            (datalen/frags) : PAGE_SIZE;
2739                 while (datalen > 0) {
2740                         if (unlikely(!pkt_dev->page)) {
2741                                 int node = numa_node_id();
2742 
2743                                 if (pkt_dev->node >= 0 && (pkt_dev->flags & F_NODE))
2744                                         node = pkt_dev->node;
2745                                 pkt_dev->page = alloc_pages_node(node, GFP_KERNEL | __GFP_ZERO, 0);
2746                                 if (!pkt_dev->page)
2747                                         break;
2748                         }
2749                         get_page(pkt_dev->page);
2750                         skb_frag_set_page(skb, i, pkt_dev->page);
2751                         skb_shinfo(skb)->frags[i].page_offset = 0;
2752                         /*last fragment, fill rest of data*/
2753                         if (i == (frags - 1))
2754                                 skb_frag_size_set(&skb_shinfo(skb)->frags[i],
2755                                     (datalen < PAGE_SIZE ? datalen : PAGE_SIZE));
2756                         else
2757                                 skb_frag_size_set(&skb_shinfo(skb)->frags[i], frag_len);
2758                         datalen -= skb_frag_size(&skb_shinfo(skb)->frags[i]);
2759                         skb->len += skb_frag_size(&skb_shinfo(skb)->frags[i]);
2760                         skb->data_len += skb_frag_size(&skb_shinfo(skb)->frags[i]);
2761                         i++;
2762                         skb_shinfo(skb)->nr_frags = i;
2763                 }
2764         }
2765 
2766         /* Stamp the time, and sequence number,
2767          * convert them to network byte order
2768          */
2769         pgh->pgh_magic = htonl(PKTGEN_MAGIC);
2770         pgh->seq_num = htonl(pkt_dev->seq_num);
2771 
2772         if (pkt_dev->flags & F_NO_TIMESTAMP) {
2773                 pgh->tv_sec = 0;
2774                 pgh->tv_usec = 0;
2775         } else {
2776                 do_gettimeofday(&timestamp);
2777                 pgh->tv_sec = htonl(timestamp.tv_sec);
2778                 pgh->tv_usec = htonl(timestamp.tv_usec);
2779         }
2780 }
2781 
2782 static struct sk_buff *pktgen_alloc_skb(struct net_device *dev,
2783                                         struct pktgen_dev *pkt_dev)
2784 {
2785         unsigned int extralen = LL_RESERVED_SPACE(dev);
2786         struct sk_buff *skb = NULL;
2787         unsigned int size;
2788 
2789         size = pkt_dev->cur_pkt_size + 64 + extralen + pkt_dev->pkt_overhead;
2790         if (pkt_dev->flags & F_NODE) {
2791                 int node = pkt_dev->node >= 0 ? pkt_dev->node : numa_node_id();
2792 
2793                 skb = __alloc_skb(NET_SKB_PAD + size, GFP_NOWAIT, 0, node);
2794                 if (likely(skb)) {
2795                         skb_reserve(skb, NET_SKB_PAD);
2796                         skb->dev = dev;
2797                 }
2798         } else {
2799                  skb = __netdev_alloc_skb(dev, size, GFP_NOWAIT);
2800         }
2801 
2802         /* the caller pre-fetches from skb->data and reserves for the mac hdr */
2803         if (likely(skb))
2804                 skb_reserve(skb, extralen - 16);
2805 
2806         return skb;
2807 }
2808 
2809 static struct sk_buff *fill_packet_ipv4(struct net_device *odev,
2810                                         struct pktgen_dev *pkt_dev)
2811 {
2812         struct sk_buff *skb = NULL;
2813         __u8 *eth;
2814         struct udphdr *udph;
2815         int datalen, iplen;
2816         struct iphdr *iph;
2817         __be16 protocol = htons(ETH_P_IP);
2818         __be32 *mpls;
2819         __be16 *vlan_tci = NULL;                 /* Encapsulates priority and VLAN ID */
2820         __be16 *vlan_encapsulated_proto = NULL;  /* packet type ID field (or len) for VLAN tag */
2821         __be16 *svlan_tci = NULL;                /* Encapsulates priority and SVLAN ID */
2822         __be16 *svlan_encapsulated_proto = NULL; /* packet type ID field (or len) for SVLAN tag */
2823         u16 queue_map;
2824 
2825         if (pkt_dev->nr_labels)
2826                 protocol = htons(ETH_P_MPLS_UC);
2827 
2828         if (pkt_dev->vlan_id != 0xffff)
2829                 protocol = htons(ETH_P_8021Q);
2830 
2831         /* Update any of the values, used when we're incrementing various
2832          * fields.
2833          */
2834         mod_cur_headers(pkt_dev);
2835         queue_map = pkt_dev->cur_queue_map;
2836 
2837         skb = pktgen_alloc_skb(odev, pkt_dev);
2838         if (!skb) {
2839                 sprintf(pkt_dev->result, "No memory");
2840                 return NULL;
2841         }
2842 
2843         prefetchw(skb->data);
2844         skb_reserve(skb, 16);
2845 
2846         /*  Reserve for ethernet and IP header  */
2847         eth = (__u8 *) skb_push(skb, 14);
2848         mpls = (__be32 *)skb_put(skb, pkt_dev->nr_labels*sizeof(__u32));
2849         if (pkt_dev->nr_labels)
2850                 mpls_push(mpls, pkt_dev);
2851 
2852         if (pkt_dev->vlan_id != 0xffff) {
2853                 if (pkt_dev->svlan_id != 0xffff) {
2854                         svlan_tci = (__be16 *)skb_put(skb, sizeof(__be16));
2855                         *svlan_tci = build_tci(pkt_dev->svlan_id,
2856                                                pkt_dev->svlan_cfi,
2857                                                pkt_dev->svlan_p);
2858                         svlan_encapsulated_proto = (__be16 *)skb_put(skb, sizeof(__be16));
2859                         *svlan_encapsulated_proto = htons(ETH_P_8021Q);
2860                 }
2861                 vlan_tci = (__be16 *)skb_put(skb, sizeof(__be16));
2862                 *vlan_tci = build_tci(pkt_dev->vlan_id,
2863                                       pkt_dev->vlan_cfi,
2864                                       pkt_dev->vlan_p);
2865                 vlan_encapsulated_proto = (__be16 *)skb_put(skb, sizeof(__be16));
2866                 *vlan_encapsulated_proto = htons(ETH_P_IP);
2867         }
2868 
2869         skb_reset_mac_header(skb);
2870         skb_set_network_header(skb, skb->len);
2871         iph = (struct iphdr *) skb_put(skb, sizeof(struct iphdr));
2872 
2873         skb_set_transport_header(skb, skb->len);
2874         udph = (struct udphdr *) skb_put(skb, sizeof(struct udphdr));
2875         skb_set_queue_mapping(skb, queue_map);
2876         skb->priority = pkt_dev->skb_priority;
2877 
2878         memcpy(eth, pkt_dev->hh, 12);
2879         *(__be16 *) & eth[12] = protocol;
2880 
2881         /* Eth + IPh + UDPh + mpls */
2882         datalen = pkt_dev->cur_pkt_size - 14 - 20 - 8 -
2883                   pkt_dev->pkt_overhead;
2884         if (datalen < 0 || datalen < sizeof(struct pktgen_hdr))
2885                 datalen = sizeof(struct pktgen_hdr);
2886 
2887         udph->source = htons(pkt_dev->cur_udp_src);
2888         udph->dest = htons(pkt_dev->cur_udp_dst);
2889         udph->len = htons(datalen + 8); /* DATA + udphdr */
2890         udph->check = 0;
2891 
2892         iph->ihl = 5;
2893         iph->version = 4;
2894         iph->ttl = 32;
2895         iph->tos = pkt_dev->tos;
2896         iph->protocol = IPPROTO_UDP;    /* UDP */
2897         iph->saddr = pkt_dev->cur_saddr;
2898         iph->daddr = pkt_dev->cur_daddr;
2899         iph->id = htons(pkt_dev->ip_id);
2900         pkt_dev->ip_id++;
2901         iph->frag_off = 0;
2902         iplen = 20 + 8 + datalen;
2903         iph->tot_len = htons(iplen);
2904         ip_send_check(iph);
2905         skb->protocol = protocol;
2906         skb->dev = odev;
2907         skb->pkt_type = PACKET_HOST;
2908 
2909         pktgen_finalize_skb(pkt_dev, skb, datalen);
2910 
2911         if (!(pkt_dev->flags & F_UDPCSUM)) {
2912                 skb->ip_summed = CHECKSUM_NONE;
2913         } else if (odev->features & (NETIF_F_HW_CSUM | NETIF_F_IP_CSUM)) {
2914                 skb->ip_summed = CHECKSUM_PARTIAL;
2915                 skb->csum = 0;
2916                 udp4_hwcsum(skb, iph->saddr, iph->daddr);
2917         } else {
2918                 __wsum csum = skb_checksum(skb, skb_transport_offset(skb), datalen + 8, 0);
2919 
2920                 /* add protocol-dependent pseudo-header */
2921                 udph->check = csum_tcpudp_magic(iph->saddr, iph->daddr,
2922                                                 datalen + 8, IPPROTO_UDP, csum);
2923 
2924                 if (udph->check == 0)
2925                         udph->check = CSUM_MANGLED_0;
2926         }
2927 
2928 #ifdef CONFIG_XFRM
2929         if (!process_ipsec(pkt_dev, skb, protocol))
2930                 return NULL;
2931 #endif
2932 
2933         return skb;
2934 }
2935 
2936 static struct sk_buff *fill_packet_ipv6(struct net_device *odev,
2937                                         struct pktgen_dev *pkt_dev)
2938 {
2939         struct sk_buff *skb = NULL;
2940         __u8 *eth;
2941         struct udphdr *udph;
2942         int datalen, udplen;
2943         struct ipv6hdr *iph;
2944         __be16 protocol = htons(ETH_P_IPV6);
2945         __be32 *mpls;
2946         __be16 *vlan_tci = NULL;                 /* Encapsulates priority and VLAN ID */
2947         __be16 *vlan_encapsulated_proto = NULL;  /* packet type ID field (or len) for VLAN tag */
2948         __be16 *svlan_tci = NULL;                /* Encapsulates priority and SVLAN ID */
2949         __be16 *svlan_encapsulated_proto = NULL; /* packet type ID field (or len) for SVLAN tag */
2950         u16 queue_map;
2951 
2952         if (pkt_dev->nr_labels)
2953                 protocol = htons(ETH_P_MPLS_UC);
2954 
2955         if (pkt_dev->vlan_id != 0xffff)
2956                 protocol = htons(ETH_P_8021Q);
2957 
2958         /* Update any of the values, used when we're incrementing various
2959          * fields.
2960          */
2961         mod_cur_headers(pkt_dev);
2962         queue_map = pkt_dev->cur_queue_map;
2963 
2964         skb = pktgen_alloc_skb(odev, pkt_dev);
2965         if (!skb) {
2966                 sprintf(pkt_dev->result, "No memory");
2967                 return NULL;
2968         }
2969 
2970         prefetchw(skb->data);
2971         skb_reserve(skb, 16);
2972 
2973         /*  Reserve for ethernet and IP header  */
2974         eth = (__u8 *) skb_push(skb, 14);
2975         mpls = (__be32 *)skb_put(skb, pkt_dev->nr_labels*sizeof(__u32));
2976         if (pkt_dev->nr_labels)
2977                 mpls_push(mpls, pkt_dev);
2978 
2979         if (pkt_dev->vlan_id != 0xffff) {
2980                 if (pkt_dev->svlan_id != 0xffff) {
2981                         svlan_tci = (__be16 *)skb_put(skb, sizeof(__be16));
2982                         *svlan_tci = build_tci(pkt_dev->svlan_id,
2983                                                pkt_dev->svlan_cfi,
2984                                                pkt_dev->svlan_p);
2985                         svlan_encapsulated_proto = (__be16 *)skb_put(skb, sizeof(__be16));
2986                         *svlan_encapsulated_proto = htons(ETH_P_8021Q);
2987                 }
2988                 vlan_tci = (__be16 *)skb_put(skb, sizeof(__be16));
2989                 *vlan_tci = build_tci(pkt_dev->vlan_id,
2990                                       pkt_dev->vlan_cfi,
2991                                       pkt_dev->vlan_p);
2992                 vlan_encapsulated_proto = (__be16 *)skb_put(skb, sizeof(__be16));
2993                 *vlan_encapsulated_proto = htons(ETH_P_IPV6);
2994         }
2995 
2996         skb_reset_mac_header(skb);
2997         skb_set_network_header(skb, skb->len);
2998         iph = (struct ipv6hdr *) skb_put(skb, sizeof(struct ipv6hdr));
2999 
3000         skb_set_transport_header(skb, skb->len);
3001         udph = (struct udphdr *) skb_put(skb, sizeof(struct udphdr));
3002         skb_set_queue_mapping(skb, queue_map);
3003         skb->priority = pkt_dev->skb_priority;
3004 
3005         memcpy(eth, pkt_dev->hh, 12);
3006         *(__be16 *) &eth[12] = protocol;
3007 
3008         /* Eth + IPh + UDPh + mpls */
3009         datalen = pkt_dev->cur_pkt_size - 14 -
3010                   sizeof(struct ipv6hdr) - sizeof(struct udphdr) -
3011                   pkt_dev->pkt_overhead;
3012 
3013         if (datalen < 0 || datalen < sizeof(struct pktgen_hdr)) {
3014                 datalen = sizeof(struct pktgen_hdr);
3015                 net_info_ratelimited("increased datalen to %d\n", datalen);
3016         }
3017 
3018         udplen = datalen + sizeof(struct udphdr);
3019         udph->source = htons(pkt_dev->cur_udp_src);
3020         udph->dest = htons(pkt_dev->cur_udp_dst);
3021         udph->len = htons(udplen);
3022         udph->check = 0;
3023 
3024         *(__be32 *) iph = htonl(0x60000000);    /* Version + flow */
3025 
3026         if (pkt_dev->traffic_class) {
3027                 /* Version + traffic class + flow (0) */
3028                 *(__be32 *)iph |= htonl(0x60000000 | (pkt_dev->traffic_class << 20));
3029         }
3030 
3031         iph->hop_limit = 32;
3032 
3033         iph->payload_len = htons(udplen);
3034         iph->nexthdr = IPPROTO_UDP;
3035 
3036         iph->daddr = pkt_dev->cur_in6_daddr;
3037         iph->saddr = pkt_dev->cur_in6_saddr;
3038 
3039         skb->protocol = protocol;
3040         skb->dev = odev;
3041         skb->pkt_type = PACKET_HOST;
3042 
3043         pktgen_finalize_skb(pkt_dev, skb, datalen);
3044 
3045         if (!(pkt_dev->flags & F_UDPCSUM)) {
3046                 skb->ip_summed = CHECKSUM_NONE;
3047         } else if (odev->features & (NETIF_F_HW_CSUM | NETIF_F_IPV6_CSUM)) {
3048                 skb->ip_summed = CHECKSUM_PARTIAL;
3049                 skb->csum_start = skb_transport_header(skb) - skb->head;
3050                 skb->csum_offset = offsetof(struct udphdr, check);
3051                 udph->check = ~csum_ipv6_magic(&iph->saddr, &iph->daddr, udplen, IPPROTO_UDP, 0);
3052         } else {
3053                 __wsum csum = skb_checksum(skb, skb_transport_offset(skb), udplen, 0);
3054 
3055                 /* add protocol-dependent pseudo-header */
3056                 udph->check = csum_ipv6_magic(&iph->saddr, &iph->daddr, udplen, IPPROTO_UDP, csum);
3057 
3058                 if (udph->check == 0)
3059                         udph->check = CSUM_MANGLED_0;
3060         }
3061 
3062         return skb;
3063 }
3064 
3065 static struct sk_buff *fill_packet(struct net_device *odev,
3066                                    struct pktgen_dev *pkt_dev)
3067 {
3068         if (pkt_dev->flags & F_IPV6)
3069                 return fill_packet_ipv6(odev, pkt_dev);
3070         else
3071                 return fill_packet_ipv4(odev, pkt_dev);
3072 }
3073 
3074 static void pktgen_clear_counters(struct pktgen_dev *pkt_dev)
3075 {
3076         pkt_dev->seq_num = 1;
3077         pkt_dev->idle_acc = 0;
3078         pkt_dev->sofar = 0;
3079         pkt_dev->tx_bytes = 0;
3080         pkt_dev->errors = 0;
3081 }
3082 
3083 /* Set up structure for sending pkts, clear counters */
3084 
3085 static void pktgen_run(struct pktgen_thread *t)
3086 {
3087         struct pktgen_dev *pkt_dev;
3088         int started = 0;
3089 
3090         func_enter();
3091 
3092         rcu_read_lock();
3093         list_for_each_entry_rcu(pkt_dev, &t->if_list, list) {
3094 
3095                 /*
3096                  * setup odev and create initial packet.
3097                  */
3098                 pktgen_setup_inject(pkt_dev);
3099 
3100                 if (pkt_dev->odev) {
3101                         pktgen_clear_counters(pkt_dev);
3102                         pkt_dev->skb = NULL;
3103                         pkt_dev->started_at = pkt_dev->next_tx = ktime_get();
3104 
3105                         set_pkt_overhead(pkt_dev);
3106 
3107                         strcpy(pkt_dev->result, "Starting");
3108                         pkt_dev->running = 1;   /* Cranke yeself! */
3109                         started++;
3110                 } else
3111                         strcpy(pkt_dev->result, "Error starting");
3112         }
3113         rcu_read_unlock();
3114         if (started)
3115                 t->control &= ~(T_STOP);
3116 }
3117 
3118 static void pktgen_stop_all_threads_ifs(struct pktgen_net *pn)
3119 {
3120         struct pktgen_thread *t;
3121 
3122         func_enter();
3123 
3124         mutex_lock(&pktgen_thread_lock);
3125 
3126         list_for_each_entry(t, &pn->pktgen_threads, th_list)
3127                 t->control |= T_STOP;
3128 
3129         mutex_unlock(&pktgen_thread_lock);
3130 }
3131 
3132 static int thread_is_running(const struct pktgen_thread *t)
3133 {
3134         const struct pktgen_dev *pkt_dev;
3135 
3136         rcu_read_lock();
3137         list_for_each_entry_rcu(pkt_dev, &t->if_list, list)
3138                 if (pkt_dev->running) {
3139                         rcu_read_unlock();
3140                         return 1;
3141                 }
3142         rcu_read_unlock();
3143         return 0;
3144 }
3145 
3146 static int pktgen_wait_thread_run(struct pktgen_thread *t)
3147 {
3148         while (thread_is_running(t)) {
3149 
3150                 msleep_interruptible(100);
3151 
3152                 if (signal_pending(current))
3153                         goto signal;
3154         }
3155         return 1;
3156 signal:
3157         return 0;
3158 }
3159 
3160 static int pktgen_wait_all_threads_run(struct pktgen_net *pn)
3161 {
3162         struct pktgen_thread *t;
3163         int sig = 1;
3164 
3165         mutex_lock(&pktgen_thread_lock);
3166 
3167         list_for_each_entry(t, &pn->pktgen_threads, th_list) {
3168                 sig = pktgen_wait_thread_run(t);
3169                 if (sig == 0)
3170                         break;
3171         }
3172 
3173         if (sig == 0)
3174                 list_for_each_entry(t, &pn->pktgen_threads, th_list)
3175                         t->control |= (T_STOP);
3176 
3177         mutex_unlock(&pktgen_thread_lock);
3178         return sig;
3179 }
3180 
3181 static void pktgen_run_all_threads(struct pktgen_net *pn)
3182 {
3183         struct pktgen_thread *t;
3184 
3185         func_enter();
3186 
3187         mutex_lock(&pktgen_thread_lock);
3188 
3189         list_for_each_entry(t, &pn->pktgen_threads, th_list)
3190                 t->control |= (T_RUN);
3191 
3192         mutex_unlock(&pktgen_thread_lock);
3193 
3194         /* Propagate thread->control  */
3195         schedule_timeout_interruptible(msecs_to_jiffies(125));
3196 
3197         pktgen_wait_all_threads_run(pn);
3198 }
3199 
3200 static void pktgen_reset_all_threads(struct pktgen_net *pn)
3201 {
3202         struct pktgen_thread *t;
3203 
3204         func_enter();
3205 
3206         mutex_lock(&pktgen_thread_lock);
3207 
3208         list_for_each_entry(t, &pn->pktgen_threads, th_list)
3209                 t->control |= (T_REMDEVALL);
3210 
3211         mutex_unlock(&pktgen_thread_lock);
3212 
3213         /* Propagate thread->control  */
3214         schedule_timeout_interruptible(msecs_to_jiffies(125));
3215 
3216         pktgen_wait_all_threads_run(pn);
3217 }
3218 
3219 static void show_results(struct pktgen_dev *pkt_dev, int nr_frags)
3220 {
3221         __u64 bps, mbps, pps;
3222         char *p = pkt_dev->result;
3223         ktime_t elapsed = ktime_sub(pkt_dev->stopped_at,
3224                                     pkt_dev->started_at);
3225         ktime_t idle = ns_to_ktime(pkt_dev->idle_acc);
3226 
3227         p += sprintf(p, "OK: %llu(c%llu+d%llu) usec, %llu (%dbyte,%dfrags)\n",
3228                      (unsigned long long)ktime_to_us(elapsed),
3229                      (unsigned long long)ktime_to_us(ktime_sub(elapsed, idle)),
3230                      (unsigned long long)ktime_to_us(idle),
3231                      (unsigned long long)pkt_dev->sofar,
3232                      pkt_dev->cur_pkt_size, nr_frags);
3233 
3234         pps = div64_u64(pkt_dev->sofar * NSEC_PER_SEC,
3235                         ktime_to_ns(elapsed));
3236 
3237         bps = pps * 8 * pkt_dev->cur_pkt_size;
3238 
3239         mbps = bps;
3240         do_div(mbps, 1000000);
3241         p += sprintf(p, "  %llupps %lluMb/sec (%llubps) errors: %llu",
3242                      (unsigned long long)pps,
3243                      (unsigned long long)mbps,
3244                      (unsigned long long)bps,
3245                      (unsigned long long)pkt_dev->errors);
3246 }
3247 
3248 /* Set stopped-at timer, remove from running list, do counters & statistics */
3249 static int pktgen_stop_device(struct pktgen_dev *pkt_dev)
3250 {
3251         int nr_frags = pkt_dev->skb ? skb_shinfo(pkt_dev->skb)->nr_frags : -1;
3252 
3253         if (!pkt_dev->running) {
3254                 pr_warn("interface: %s is already stopped\n",
3255                         pkt_dev->odevname);
3256                 return -EINVAL;
3257         }
3258 
3259         pkt_dev->running = 0;
3260         kfree_skb(pkt_dev->skb);
3261         pkt_dev->skb = NULL;
3262         pkt_dev->stopped_at = ktime_get();
3263 
3264         show_results(pkt_dev, nr_frags);
3265 
3266         return 0;
3267 }
3268 
3269 static struct pktgen_dev *next_to_run(struct pktgen_thread *t)
3270 {
3271         struct pktgen_dev *pkt_dev, *best = NULL;
3272 
3273         rcu_read_lock();
3274         list_for_each_entry_rcu(pkt_dev, &t->if_list, list) {
3275                 if (!pkt_dev->running)
3276                         continue;
3277                 if (best == NULL)
3278                         best = pkt_dev;
3279                 else if (ktime_compare(pkt_dev->next_tx, best->next_tx) < 0)
3280                         best = pkt_dev;
3281         }
3282         rcu_read_unlock();
3283 
3284         return best;
3285 }
3286 
3287 static void pktgen_stop(struct pktgen_thread *t)
3288 {
3289         struct pktgen_dev *pkt_dev;
3290 
3291         func_enter();
3292 
3293         rcu_read_lock();
3294 
3295         list_for_each_entry_rcu(pkt_dev, &t->if_list, list) {
3296                 pktgen_stop_device(pkt_dev);
3297         }
3298 
3299         rcu_read_unlock();
3300 }
3301 
3302 /*
3303  * one of our devices needs to be removed - find it
3304  * and remove it
3305  */
3306 static void pktgen_rem_one_if(struct pktgen_thread *t)
3307 {
3308         struct list_head *q, *n;
3309         struct pktgen_dev *cur;
3310 
3311         func_enter();
3312 
3313         list_for_each_safe(q, n, &t->if_list) {
3314                 cur = list_entry(q, struct pktgen_dev, list);
3315 
3316                 if (!cur->removal_mark)
3317                         continue;
3318 
3319                 kfree_skb(cur->skb);
3320                 cur->skb = NULL;
3321 
3322                 pktgen_remove_device(t, cur);
3323 
3324                 break;
3325         }
3326 }
3327 
3328 static void pktgen_rem_all_ifs(struct pktgen_thread *t)
3329 {
3330         struct list_head *q, *n;
3331         struct pktgen_dev *cur;
3332 
3333         func_enter();
3334 
3335         /* Remove all devices, free mem */
3336 
3337         list_for_each_safe(q, n, &t->if_list) {
3338                 cur = list_entry(q, struct pktgen_dev, list);
3339 
3340                 kfree_skb(cur->skb);
3341                 cur->skb = NULL;
3342 
3343                 pktgen_remove_device(t, cur);
3344         }
3345 }
3346 
3347 static void pktgen_rem_thread(struct pktgen_thread *t)
3348 {
3349         /* Remove from the thread list */
3350         remove_proc_entry(t->tsk->comm, t->net->proc_dir);
3351 }
3352 
3353 static void pktgen_resched(struct pktgen_dev *pkt_dev)
3354 {
3355         ktime_t idle_start = ktime_get();
3356         schedule();
3357         pkt_dev->idle_acc += ktime_to_ns(ktime_sub(ktime_get(), idle_start));
3358 }
3359 
3360 static void pktgen_wait_for_skb(struct pktgen_dev *pkt_dev)
3361 {
3362         ktime_t idle_start = ktime_get();
3363 
3364         while (atomic_read(&(pkt_dev->skb->users)) != 1) {
3365                 if (signal_pending(current))
3366                         break;
3367 
3368                 if (need_resched())
3369                         pktgen_resched(pkt_dev);
3370                 else
3371                         cpu_relax();
3372         }
3373         pkt_dev->idle_acc += ktime_to_ns(ktime_sub(ktime_get(), idle_start));
3374 }
3375 
3376 static void pktgen_xmit(struct pktgen_dev *pkt_dev)
3377 {
3378         unsigned int burst = ACCESS_ONCE(pkt_dev->burst);
3379         struct net_device *odev = pkt_dev->odev;
3380         struct netdev_queue *txq;
3381         struct sk_buff *skb;
3382         int ret;
3383 
3384         /* If device is offline, then don't send */
3385         if (unlikely(!netif_running(odev) || !netif_carrier_ok(odev))) {
3386                 pktgen_stop_device(pkt_dev);
3387                 return;
3388         }
3389 
3390         /* This is max DELAY, this has special meaning of
3391          * "never transmit"
3392          */
3393         if (unlikely(pkt_dev->delay == ULLONG_MAX)) {
3394                 pkt_dev->next_tx = ktime_add_ns(ktime_get(), ULONG_MAX);
3395                 return;
3396         }
3397 
3398         /* If no skb or clone count exhausted then get new one */
3399         if (!pkt_dev->skb || (pkt_dev->last_ok &&
3400                               ++pkt_dev->clone_count >= pkt_dev->clone_skb)) {
3401                 /* build a new pkt */
3402                 kfree_skb(pkt_dev->skb);
3403 
3404                 pkt_dev->skb = fill_packet(odev, pkt_dev);
3405                 if (pkt_dev->skb == NULL) {
3406                         pr_err("ERROR: couldn't allocate skb in fill_packet\n");
3407                         schedule();
3408                         pkt_dev->clone_count--; /* back out increment, OOM */
3409                         return;
3410                 }
3411                 pkt_dev->last_pkt_size = pkt_dev->skb->len;
3412                 pkt_dev->clone_count = 0;       /* reset counter */
3413         }
3414 
3415         if (pkt_dev->delay && pkt_dev->last_ok)
3416                 spin(pkt_dev, pkt_dev->next_tx);
3417 
3418         if (pkt_dev->xmit_mode == M_NETIF_RECEIVE) {
3419                 skb = pkt_dev->skb;
3420                 skb->protocol = eth_type_trans(skb, skb->dev);
3421                 atomic_add(burst, &skb->users);
3422                 local_bh_disable();
3423                 do {
3424                         ret = netif_receive_skb(skb);
3425                         if (ret == NET_RX_DROP)
3426                                 pkt_dev->errors++;
3427                         pkt_dev->sofar++;
3428                         pkt_dev->seq_num++;
3429                         if (atomic_read(&skb->users) != burst) {
3430                                 /* skb was queued by rps/rfs or taps,
3431                                  * so cannot reuse this skb
3432                                  */
3433                                 atomic_sub(burst - 1, &skb->users);
3434                                 /* get out of the loop and wait
3435                                  * until skb is consumed
3436                                  */
3437                                 break;
3438                         }
3439                         /* skb was 'freed' by stack, so clean few
3440                          * bits and reuse it
3441                          */
3442                         skb_reset_tc(skb);
3443                 } while (--burst > 0);
3444                 goto out; /* Skips xmit_mode M_START_XMIT */
3445         } else if (pkt_dev->xmit_mode == M_QUEUE_XMIT) {
3446                 local_bh_disable();
3447                 atomic_inc(&pkt_dev->skb->users);
3448 
3449                 ret = dev_queue_xmit(pkt_dev->skb);
3450                 switch (ret) {
3451                 case NET_XMIT_SUCCESS:
3452                         pkt_dev->sofar++;
3453                         pkt_dev->seq_num++;
3454                         pkt_dev->tx_bytes += pkt_dev->last_pkt_size;
3455                         break;
3456                 case NET_XMIT_DROP:
3457                 case NET_XMIT_CN:
3458                 /* These are all valid return codes for a qdisc but
3459                  * indicate packets are being dropped or will likely
3460                  * be dropped soon.
3461                  */
3462                 case NETDEV_TX_BUSY:
3463                 /* qdisc may call dev_hard_start_xmit directly in cases
3464                  * where no queues exist e.g. loopback device, virtual
3465                  * devices, etc. In this case we need to handle
3466                  * NETDEV_TX_ codes.
3467                  */
3468                 default:
3469                         pkt_dev->errors++;
3470                         net_info_ratelimited("%s xmit error: %d\n",
3471                                              pkt_dev->odevname, ret);
3472                         break;
3473                 }
3474                 goto out;
3475         }
3476 
3477         txq = skb_get_tx_queue(odev, pkt_dev->skb);
3478 
3479         local_bh_disable();
3480 
3481         HARD_TX_LOCK(odev, txq, smp_processor_id());
3482 
3483         if (unlikely(netif_xmit_frozen_or_drv_stopped(txq))) {
3484                 ret = NETDEV_TX_BUSY;
3485                 pkt_dev->last_ok = 0;
3486                 goto unlock;
3487         }
3488         atomic_add(burst, &pkt_dev->skb->users);
3489 
3490 xmit_more:
3491         ret = netdev_start_xmit(pkt_dev->skb, odev, txq, --burst > 0);
3492 
3493         switch (ret) {
3494         case NETDEV_TX_OK:
3495                 pkt_dev->last_ok = 1;
3496                 pkt_dev->sofar++;
3497                 pkt_dev->seq_num++;
3498                 pkt_dev->tx_bytes += pkt_dev->last_pkt_size;
3499                 if (burst > 0 && !netif_xmit_frozen_or_drv_stopped(txq))
3500                         goto xmit_more;
3501                 break;
3502         case NET_XMIT_DROP:
3503         case NET_XMIT_CN:
3504                 /* skb has been consumed */
3505                 pkt_dev->errors++;
3506                 break;
3507         default: /* Drivers are not supposed to return other values! */
3508                 net_info_ratelimited("%s xmit error: %d\n",
3509                                      pkt_dev->odevname, ret);
3510                 pkt_dev->errors++;
3511                 /* fallthru */
3512         case NETDEV_TX_BUSY:
3513                 /* Retry it next time */
3514                 atomic_dec(&(pkt_dev->skb->users));
3515                 pkt_dev->last_ok = 0;
3516         }
3517         if (unlikely(burst))
3518                 atomic_sub(burst, &pkt_dev->skb->users);
3519 unlock:
3520         HARD_TX_UNLOCK(odev, txq);
3521 
3522 out:
3523         local_bh_enable();
3524 
3525         /* If pkt_dev->count is zero, then run forever */
3526         if ((pkt_dev->count != 0) && (pkt_dev->sofar >= pkt_dev->count)) {
3527                 pktgen_wait_for_skb(pkt_dev);
3528 
3529                 /* Done with this */
3530                 pktgen_stop_device(pkt_dev);
3531         }
3532 }
3533 
3534 /*
3535  * Main loop of the thread goes here
3536  */
3537 
3538 static int pktgen_thread_worker(void *arg)
3539 {
3540         DEFINE_WAIT(wait);
3541         struct pktgen_thread *t = arg;
3542         struct pktgen_dev *pkt_dev = NULL;
3543         int cpu = t->cpu;
3544 
3545         BUG_ON(smp_processor_id() != cpu);
3546 
3547         init_waitqueue_head(&t->queue);
3548         complete(&t->start_done);
3549 
3550         pr_debug("starting pktgen/%d:  pid=%d\n", cpu, task_pid_nr(current));
3551 
3552         set_freezable();
3553 
3554         while (!kthread_should_stop()) {
3555                 pkt_dev = next_to_run(t);
3556 
3557                 if (unlikely(!pkt_dev && t->control == 0)) {
3558                         if (t->net->pktgen_exiting)
3559                                 break;
3560                         wait_event_interruptible_timeout(t->queue,
3561                                                          t->control != 0,
3562                                                          HZ/10);
3563                         try_to_freeze();
3564                         continue;
3565                 }
3566 
3567                 if (likely(pkt_dev)) {
3568                         pktgen_xmit(pkt_dev);
3569 
3570                         if (need_resched())
3571                                 pktgen_resched(pkt_dev);
3572                         else
3573                                 cpu_relax();
3574                 }
3575 
3576                 if (t->control & T_STOP) {
3577                         pktgen_stop(t);
3578                         t->control &= ~(T_STOP);
3579                 }
3580 
3581                 if (t->control & T_RUN) {
3582                         pktgen_run(t);
3583                         t->control &= ~(T_RUN);
3584                 }
3585 
3586                 if (t->control & T_REMDEVALL) {
3587                         pktgen_rem_all_ifs(t);
3588                         t->control &= ~(T_REMDEVALL);
3589                 }
3590 
3591                 if (t->control & T_REMDEV) {
3592                         pktgen_rem_one_if(t);
3593                         t->control &= ~(T_REMDEV);
3594                 }
3595 
3596                 try_to_freeze();
3597         }
3598 
3599         pr_debug("%s stopping all device\n", t->tsk->comm);
3600         pktgen_stop(t);
3601 
3602         pr_debug("%s removing all device\n", t->tsk->comm);
3603         pktgen_rem_all_ifs(t);
3604 
3605         pr_debug("%s removing thread\n", t->tsk->comm);
3606         pktgen_rem_thread(t);
3607 
3608         return 0;
3609 }
3610 
3611 static struct pktgen_dev *pktgen_find_dev(struct pktgen_thread *t,
3612                                           const char *ifname, bool exact)
3613 {
3614         struct pktgen_dev *p, *pkt_dev = NULL;
3615         size_t len = strlen(ifname);
3616 
3617         rcu_read_lock();
3618         list_for_each_entry_rcu(p, &t->if_list, list)
3619                 if (strncmp(p->odevname, ifname, len) == 0) {
3620                         if (p->odevname[len]) {
3621                                 if (exact || p->odevname[len] != '@')
3622                                         continue;
3623                         }
3624                         pkt_dev = p;
3625                         break;
3626                 }
3627 
3628         rcu_read_unlock();
3629         pr_debug("find_dev(%s) returning %p\n", ifname, pkt_dev);
3630         return pkt_dev;
3631 }
3632 
3633 /*
3634  * Adds a dev at front of if_list.
3635  */
3636 
3637 static int add_dev_to_thread(struct pktgen_thread *t,
3638                              struct pktgen_dev *pkt_dev)
3639 {
3640         int rv = 0;
3641 
3642         /* This function cannot be called concurrently, as its called
3643          * under pktgen_thread_lock mutex, but it can run from
3644          * userspace on another CPU than the kthread.  The if_lock()
3645          * is used here to sync with concurrent instances of
3646          * _rem_dev_from_if_list() invoked via kthread, which is also
3647          * updating the if_list */
3648         if_lock(t);
3649 
3650         if (pkt_dev->pg_thread) {
3651                 pr_err("ERROR: already assigned to a thread\n");
3652                 rv = -EBUSY;
3653                 goto out;
3654         }
3655 
3656         pkt_dev->running = 0;
3657         pkt_dev->pg_thread = t;
3658         list_add_rcu(&pkt_dev->list, &t->if_list);
3659 
3660 out:
3661         if_unlock(t);
3662         return rv;
3663 }
3664 
3665 /* Called under thread lock */
3666 
3667 static int pktgen_add_device(struct pktgen_thread *t, const char *ifname)
3668 {
3669         struct pktgen_dev *pkt_dev;
3670         int err;
3671         int node = cpu_to_node(t->cpu);
3672 
3673         /* We don't allow a device to be on several threads */
3674 
3675         pkt_dev = __pktgen_NN_threads(t->net, ifname, FIND);
3676         if (pkt_dev) {
3677                 pr_err("ERROR: interface already used\n");
3678                 return -EBUSY;
3679         }
3680 
3681         pkt_dev = kzalloc_node(sizeof(struct pktgen_dev), GFP_KERNEL, node);
3682         if (!pkt_dev)
3683                 return -ENOMEM;
3684 
3685         strcpy(pkt_dev->odevname, ifname);
3686         pkt_dev->flows = vzalloc_node(MAX_CFLOWS * sizeof(struct flow_state),
3687                                       node);
3688         if (pkt_dev->flows == NULL) {
3689                 kfree(pkt_dev);
3690                 return -ENOMEM;
3691         }
3692 
3693         pkt_dev->removal_mark = 0;
3694         pkt_dev->nfrags = 0;
3695         pkt_dev->delay = pg_delay_d;
3696         pkt_dev->count = pg_count_d;
3697         pkt_dev->sofar = 0;
3698         pkt_dev->udp_src_min = 9;       /* sink port */
3699         pkt_dev->udp_src_max = 9;
3700         pkt_dev->udp_dst_min = 9;
3701         pkt_dev->udp_dst_max = 9;
3702         pkt_dev->vlan_p = 0;
3703         pkt_dev->vlan_cfi = 0;
3704         pkt_dev->vlan_id = 0xffff;
3705         pkt_dev->svlan_p = 0;
3706         pkt_dev->svlan_cfi = 0;
3707         pkt_dev->svlan_id = 0xffff;
3708         pkt_dev->burst = 1;
3709         pkt_dev->node = -1;
3710 
3711         err = pktgen_setup_dev(t->net, pkt_dev, ifname);
3712         if (err)
3713                 goto out1;
3714         if (pkt_dev->odev->priv_flags & IFF_TX_SKB_SHARING)
3715                 pkt_dev->clone_skb = pg_clone_skb_d;
3716 
3717         pkt_dev->entry = proc_create_data(ifname, 0600, t->net->proc_dir,
3718                                           &pktgen_if_fops, pkt_dev);
3719         if (!pkt_dev->entry) {
3720                 pr_err("cannot create %s/%s procfs entry\n",
3721                        PG_PROC_DIR, ifname);
3722                 err = -EINVAL;
3723                 goto out2;
3724         }
3725 #ifdef CONFIG_XFRM
3726         pkt_dev->ipsmode = XFRM_MODE_TRANSPORT;
3727         pkt_dev->ipsproto = IPPROTO_ESP;
3728 
3729         /* xfrm tunnel mode needs additional dst to extract outter
3730          * ip header protocol/ttl/id field, here creat a phony one.
3731          * instead of looking for a valid rt, which definitely hurting
3732          * performance under such circumstance.
3733          */
3734         pkt_dev->dstops.family = AF_INET;
3735         pkt_dev->dst.dev = pkt_dev->odev;
3736         dst_init_metrics(&pkt_dev->dst, pktgen_dst_metrics, false);
3737         pkt_dev->dst.child = &pkt_dev->dst;
3738         pkt_dev->dst.ops = &pkt_dev->dstops;
3739 #endif
3740 
3741         return add_dev_to_thread(t, pkt_dev);
3742 out2:
3743         dev_put(pkt_dev->odev);
3744 out1:
3745 #ifdef CONFIG_XFRM
3746         free_SAs(pkt_dev);
3747 #endif
3748         vfree(pkt_dev->flows);
3749         kfree(pkt_dev);
3750         return err;
3751 }
3752 
3753 static int __net_init pktgen_create_thread(int cpu, struct pktgen_net *pn)
3754 {
3755         struct pktgen_thread *t;
3756         struct proc_dir_entry *pe;
3757         struct task_struct *p;
3758 
3759         t = kzalloc_node(sizeof(struct pktgen_thread), GFP_KERNEL,
3760                          cpu_to_node(cpu));
3761         if (!t) {
3762                 pr_err("ERROR: out of memory, can't create new thread\n");
3763                 return -ENOMEM;
3764         }
3765 
3766         mutex_init(&t->if_lock);
3767         t->cpu = cpu;
3768 
3769         INIT_LIST_HEAD(&t->if_list);
3770 
3771         list_add_tail(&t->th_list, &pn->pktgen_threads);
3772         init_completion(&t->start_done);
3773 
3774         p = kthread_create_on_node(pktgen_thread_worker,
3775                                    t,
3776                                    cpu_to_node(cpu),
3777                                    "kpktgend_%d", cpu);
3778         if (IS_ERR(p)) {
3779                 pr_err("kernel_thread() failed for cpu %d\n", t->cpu);
3780                 list_del(&t->th_list);
3781                 kfree(t);
3782                 return PTR_ERR(p);
3783         }
3784         kthread_bind(p, cpu);
3785         t->tsk = p;
3786 
3787         pe = proc_create_data(t->tsk->comm, 0600, pn->proc_dir,
3788                               &pktgen_thread_fops, t);
3789         if (!pe) {
3790                 pr_err("cannot create %s/%s procfs entry\n",
3791                        PG_PROC_DIR, t->tsk->comm);
3792                 kthread_stop(p);
3793                 list_del(&t->th_list);
3794                 kfree(t);
3795                 return -EINVAL;
3796         }
3797 
3798         t->net = pn;
3799         get_task_struct(p);
3800         wake_up_process(p);
3801         wait_for_completion(&t->start_done);
3802 
3803         return 0;
3804 }
3805 
3806 /*
3807  * Removes a device from the thread if_list.
3808  */
3809 static void _rem_dev_from_if_list(struct pktgen_thread *t,
3810                                   struct pktgen_dev *pkt_dev)
3811 {
3812         struct list_head *q, *n;
3813         struct pktgen_dev *p;
3814 
3815         if_lock(t);
3816         list_for_each_safe(q, n, &t->if_list) {
3817                 p = list_entry(q, struct pktgen_dev, list);
3818                 if (p == pkt_dev)
3819                         list_del_rcu(&p->list);
3820         }
3821         if_unlock(t);
3822 }
3823 
3824 static int pktgen_remove_device(struct pktgen_thread *t,
3825                                 struct pktgen_dev *pkt_dev)
3826 {
3827         pr_debug("remove_device pkt_dev=%p\n", pkt_dev);
3828 
3829         if (pkt_dev->running) {
3830                 pr_warn("WARNING: trying to remove a running interface, stopping it now\n");
3831                 pktgen_stop_device(pkt_dev);
3832         }
3833 
3834         /* Dis-associate from the interface */
3835 
3836         if (pkt_dev->odev) {
3837                 dev_put(pkt_dev->odev);
3838                 pkt_dev->odev = NULL;
3839         }
3840 
3841         /* Remove proc before if_list entry, because add_device uses
3842          * list to determine if interface already exist, avoid race
3843          * with proc_create_data() */
3844         proc_remove(pkt_dev->entry);
3845 
3846         /* And update the thread if_list */
3847         _rem_dev_from_if_list(t, pkt_dev);
3848 
3849 #ifdef CONFIG_XFRM
3850         free_SAs(pkt_dev);
3851 #endif
3852         vfree(pkt_dev->flows);
3853         if (pkt_dev->page)
3854                 put_page(pkt_dev->page);
3855         kfree_rcu(pkt_dev, rcu);
3856         return 0;
3857 }
3858 
3859 static int __net_init pg_net_init(struct net *net)
3860 {
3861         struct pktgen_net *pn = net_generic(net, pg_net_id);
3862         struct proc_dir_entry *pe;
3863         int cpu, ret = 0;
3864 
3865         pn->net = net;
3866         INIT_LIST_HEAD(&pn->pktgen_threads);
3867         pn->pktgen_exiting = false;
3868         pn->proc_dir = proc_mkdir(PG_PROC_DIR, pn->net->proc_net);
3869         if (!pn->proc_dir) {
3870                 pr_warn("cannot create /proc/net/%s\n", PG_PROC_DIR);
3871                 return -ENODEV;
3872         }
3873         pe = proc_create(PGCTRL, 0600, pn->proc_dir, &pktgen_fops);
3874         if (pe == NULL) {
3875                 pr_err("cannot create %s procfs entry\n", PGCTRL);
3876                 ret = -EINVAL;
3877                 goto remove;
3878         }
3879 
3880         for_each_online_cpu(cpu) {
3881                 int err;
3882 
3883                 err = pktgen_create_thread(cpu, pn);
3884                 if (err)
3885                         pr_warn("Cannot create thread for cpu %d (%d)\n",
3886                                    cpu, err);
3887         }
3888 
3889         if (list_empty(&pn->pktgen_threads)) {
3890                 pr_err("Initialization failed for all threads\n");
3891                 ret = -ENODEV;
3892                 goto remove_entry;
3893         }
3894 
3895         return 0;
3896 
3897 remove_entry:
3898         remove_proc_entry(PGCTRL, pn->proc_dir);
3899 remove:
3900         remove_proc_entry(PG_PROC_DIR, pn->net->proc_net);
3901         return ret;
3902 }
3903 
3904 static void __net_exit pg_net_exit(struct net *net)
3905 {
3906         struct pktgen_net *pn = net_generic(net, pg_net_id);
3907         struct pktgen_thread *t;
3908         struct list_head *q, *n;
3909         LIST_HEAD(list);
3910 
3911         /* Stop all interfaces & threads */
3912         pn->pktgen_exiting = true;
3913 
3914         mutex_lock(&pktgen_thread_lock);
3915         list_splice_init(&pn->pktgen_threads, &list);
3916         mutex_unlock(&pktgen_thread_lock);
3917 
3918         list_for_each_safe(q, n, &list) {
3919                 t = list_entry(q, struct pktgen_thread, th_list);
3920                 list_del(&t->th_list);
3921                 kthread_stop(t->tsk);
3922                 put_task_struct(t->tsk);
3923                 kfree(t);
3924         }
3925 
3926         remove_proc_entry(PGCTRL, pn->proc_dir);
3927         remove_proc_entry(PG_PROC_DIR, pn->net->proc_net);
3928 }
3929 
3930 static struct pernet_operations pg_net_ops = {
3931         .init = pg_net_init,
3932         .exit = pg_net_exit,
3933         .id   = &pg_net_id,
3934         .size = sizeof(struct pktgen_net),
3935 };
3936 
3937 static int __init pg_init(void)
3938 {
3939         int ret = 0;
3940 
3941         pr_info("%s", version);
3942         ret = register_pernet_subsys(&pg_net_ops);
3943         if (ret)
3944                 return ret;
3945         ret = register_netdevice_notifier(&pktgen_notifier_block);
3946         if (ret)
3947                 unregister_pernet_subsys(&pg_net_ops);
3948 
3949         return ret;
3950 }
3951 
3952 static void __exit pg_cleanup(void)
3953 {
3954         unregister_netdevice_notifier(&pktgen_notifier_block);
3955         unregister_pernet_subsys(&pg_net_ops);
3956         /* Don't need rcu_barrier() due to use of kfree_rcu() */
3957 }
3958 
3959 module_init(pg_init);
3960 module_exit(pg_cleanup);
3961 
3962 MODULE_AUTHOR("Robert Olsson <robert.olsson@its.uu.se>");
3963 MODULE_DESCRIPTION("Packet Generator tool");
3964 MODULE_LICENSE("GPL");
3965 MODULE_VERSION(VERSION);
3966 module_param(pg_count_d, int, 0);
3967 MODULE_PARM_DESC(pg_count_d, "Default number of packets to inject");
3968 module_param(pg_delay_d, int, 0);
3969 MODULE_PARM_DESC(pg_delay_d, "Default delay between packets (nanoseconds)");
3970 module_param(pg_clone_skb_d, int, 0);
3971 MODULE_PARM_DESC(pg_clone_skb_d, "Default number of copies of the same packet");
3972 module_param(debug, int, 0);
3973 MODULE_PARM_DESC(debug, "Enable debugging of pktgen module");
3974 

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